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Finding the Fourth Proportional to 987.72, 1,363.30 and 656.16

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Solution

The fourth proportional to 987.72, 1,363.30 and 656.16 is: 905.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.72 : 1,363.30 = 656.16 : x
  2. Step 2: Convert to fraction form
    987.72/1,363.30 = 656.16/x
  3. Step 3: Cross multiply
    987.72x = 1,363.30 × 656.16
  4. Step 4: Simplify right side
    987.72x = 894,542.93
  5. Step 5: Solve for x
    x = 894,542.93/987.72
  6. Step 6: Final answer
    x = 905.66

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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.