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Finding the Fourth Proportional to 987.06, 1,479.78 and 337.80

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Solution

The fourth proportional to 987.06, 1,479.78 and 337.80 is: 506.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.06 : 1,479.78 = 337.80 : x
  2. Step 2: Convert to fraction form
    987.06/1,479.78 = 337.80/x
  3. Step 3: Cross multiply
    987.06x = 1,479.78 × 337.80
  4. Step 4: Simplify right side
    987.06x = 499,869.68
  5. Step 5: Solve for x
    x = 499,869.68/987.06
  6. Step 6: Final answer
    x = 506.42

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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.