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Finding the Fourth Proportional to 987.24, 1,363.04 and 656.12

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Solution

The fourth proportional to 987.24, 1,363.04 and 656.12 is: 905.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.24 : 1,363.04 = 656.12 : x
  2. Step 2: Convert to fraction form
    987.24/1,363.04 = 656.12/x
  3. Step 3: Cross multiply
    987.24x = 1,363.04 × 656.12
  4. Step 4: Simplify right side
    987.24x = 894,317.80
  5. Step 5: Solve for x
    x = 894,317.80/987.24
  6. Step 6: Final answer
    x = 905.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.