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Finding the Fourth Proportional to 478.53, 717.26 and 458.28

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Solution

The fourth proportional to 478.53, 717.26 and 458.28 is: 686.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.53 : 717.26 = 458.28 : x
  2. Step 2: Convert to fraction form
    478.53/717.26 = 458.28/x
  3. Step 3: Cross multiply
    478.53x = 717.26 × 458.28
  4. Step 4: Simplify right side
    478.53x = 328,703.62
  5. Step 5: Solve for x
    x = 328,703.62/478.53
  6. Step 6: Final answer
    x = 686.90

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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.