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Finding the Fourth Proportional to 861.59, 1,189.18 and 525.56

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Solution

The fourth proportional to 861.59, 1,189.18 and 525.56 is: 725.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.59 : 1,189.18 = 525.56 : x
  2. Step 2: Convert to fraction form
    861.59/1,189.18 = 525.56/x
  3. Step 3: Cross multiply
    861.59x = 1,189.18 × 525.56
  4. Step 4: Simplify right side
    861.59x = 624,990.19
  5. Step 5: Solve for x
    x = 624,990.19/861.59
  6. Step 6: Final answer
    x = 725.39

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Double scale
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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.