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Finding the Fourth Proportional to 987.32, 1,477.80 and 715.28

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Solution

The fourth proportional to 987.32, 1,477.80 and 715.28 is: 1,070.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.32 : 1,477.80 = 715.28 : x
  2. Step 2: Convert to fraction form
    987.32/1,477.80 = 715.28/x
  3. Step 3: Cross multiply
    987.32x = 1,477.80 × 715.28
  4. Step 4: Simplify right side
    987.32x = 1,057,040.78
  5. Step 5: Solve for x
    x = 1,057,040.78/987.32
  6. Step 6: Final answer
    x = 1,070.62

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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.