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Finding the Fourth Proportional to 917.52, 1,375.92 and 478.64

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Solution

The fourth proportional to 917.52, 1,375.92 and 478.64 is: 717.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.52 : 1,375.92 = 478.64 : x
  2. Step 2: Convert to fraction form
    917.52/1,375.92 = 478.64/x
  3. Step 3: Cross multiply
    917.52x = 1,375.92 × 478.64
  4. Step 4: Simplify right side
    917.52x = 658,563.47
  5. Step 5: Solve for x
    x = 658,563.47/917.52
  6. Step 6: Final answer
    x = 717.76

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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.