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Finding the Fourth Proportional to 877.55, 1,315.24 and 487.53

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Solution

The fourth proportional to 877.55, 1,315.24 and 487.53 is: 730.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.55 : 1,315.24 = 487.53 : x
  2. Step 2: Convert to fraction form
    877.55/1,315.24 = 487.53/x
  3. Step 3: Cross multiply
    877.55x = 1,315.24 × 487.53
  4. Step 4: Simplify right side
    877.55x = 641,217.74
  5. Step 5: Solve for x
    x = 641,217.74/877.55
  6. Step 6: Final answer
    x = 730.69

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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.