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Finding the Fourth Proportional to 664.17, 915.29 and 487.18

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Solution

The fourth proportional to 664.17, 915.29 and 487.18 is: 671.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.17 : 915.29 = 487.18 : x
  2. Step 2: Convert to fraction form
    664.17/915.29 = 487.18/x
  3. Step 3: Cross multiply
    664.17x = 915.29 × 487.18
  4. Step 4: Simplify right side
    664.17x = 445,910.98
  5. Step 5: Solve for x
    x = 445,910.98/664.17
  6. Step 6: Final answer
    x = 671.38

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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.