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Finding the Fourth Proportional to 3,108.76, 4,290.10 and 1,929.12

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Solution

The fourth proportional to 3,108.76, 4,290.10 and 1,929.12 is: 2,662.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,108.76 : 4,290.10 = 1,929.12 : x
  2. Step 2: Convert to fraction form
    3,108.76/4,290.10 = 1,929.12/x
  3. Step 3: Cross multiply
    3,108.76x = 4,290.10 × 1,929.12
  4. Step 4: Simplify right side
    3,108.76x = 8,276,117.71
  5. Step 5: Solve for x
    x = 8,276,117.71/3,108.76
  6. Step 6: Final answer
    x = 2,662.19

Related Problems

Find fourth proportional to 1,554.38, 2,145.05 and 964.56
Half scale
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Double scale
Find fourth proportional to 3,109.76, 4,291.48 and 1,930.12
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.