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Finding the Fourth Proportional to 1,117.40, 1,676.11 and 386.99

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Solution

The fourth proportional to 1,117.40, 1,676.11 and 386.99 is: 580.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.40 : 1,676.11 = 386.99 : x
  2. Step 2: Convert to fraction form
    1,117.40/1,676.11 = 386.99/x
  3. Step 3: Cross multiply
    1,117.40x = 1,676.11 × 386.99
  4. Step 4: Simplify right side
    1,117.40x = 648,630.76
  5. Step 5: Solve for x
    x = 648,630.76/1,117.40
  6. Step 6: Final answer
    x = 580.48

Related Problems

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Half scale
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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.