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Finding the Fourth Proportional to 861.55, 1,189.14 and 530.26

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Solution

The fourth proportional to 861.55, 1,189.14 and 530.26 is: 731.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.55 : 1,189.14 = 530.26 : x
  2. Step 2: Convert to fraction form
    861.55/1,189.14 = 530.26/x
  3. Step 3: Cross multiply
    861.55x = 1,189.14 × 530.26
  4. Step 4: Simplify right side
    861.55x = 630,553.38
  5. Step 5: Solve for x
    x = 630,553.38/861.55
  6. Step 6: Final answer
    x = 731.88

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1.5x scale

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.