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Finding the Fourth Proportional to 5,315.40, 7,973.10 and 1,419.66

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Solution

The fourth proportional to 5,315.40, 7,973.10 and 1,419.66 is: 2,129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,315.40 : 7,973.10 = 1,419.66 : x
  2. Step 2: Convert to fraction form
    5,315.40/7,973.10 = 1,419.66/x
  3. Step 3: Cross multiply
    5,315.40x = 7,973.10 × 1,419.66
  4. Step 4: Simplify right side
    5,315.40x = 11,319,091.15
  5. Step 5: Solve for x
    x = 11,319,091.15/5,315.40
  6. Step 6: Final answer
    x = 2,129.49

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.