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Finding the Fourth Proportional to 861.87, 1,293.03 and 553.88

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Solution

The fourth proportional to 861.87, 1,293.03 and 553.88 is: 830.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.87 : 1,293.03 = 553.88 : x
  2. Step 2: Convert to fraction form
    861.87/1,293.03 = 553.88/x
  3. Step 3: Cross multiply
    861.87x = 1,293.03 × 553.88
  4. Step 4: Simplify right side
    861.87x = 716,176.99
  5. Step 5: Solve for x
    x = 716,176.99/861.87
  6. Step 6: Final answer
    x = 830.96

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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.