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Finding the Fourth Proportional to 987.13, 1,479.78 and 337.71

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Solution

The fourth proportional to 987.13, 1,479.78 and 337.71 is: 506.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.13 : 1,479.78 = 337.71 : x
  2. Step 2: Convert to fraction form
    987.13/1,479.78 = 337.71/x
  3. Step 3: Cross multiply
    987.13x = 1,479.78 × 337.71
  4. Step 4: Simplify right side
    987.13x = 499,736.50
  5. Step 5: Solve for x
    x = 499,736.50/987.13
  6. Step 6: Final answer
    x = 506.25

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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.