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Finding the Fourth Proportional to 987.30, 1,479.06 and 499.68

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Solution

The fourth proportional to 987.30, 1,479.06 and 499.68 is: 748.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.30 : 1,479.06 = 499.68 : x
  2. Step 2: Convert to fraction form
    987.30/1,479.06 = 499.68/x
  3. Step 3: Cross multiply
    987.30x = 1,479.06 × 499.68
  4. Step 4: Simplify right side
    987.30x = 739,056.70
  5. Step 5: Solve for x
    x = 739,056.70/987.30
  6. Step 6: Final answer
    x = 748.56

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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.