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Finding the Fourth Proportional to 664.61, 917.17 and 402.47

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Solution

The fourth proportional to 664.61, 917.17 and 402.47 is: 555.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.61 : 917.17 = 402.47 : x
  2. Step 2: Convert to fraction form
    664.61/917.17 = 402.47/x
  3. Step 3: Cross multiply
    664.61x = 917.17 × 402.47
  4. Step 4: Simplify right side
    664.61x = 369,133.52
  5. Step 5: Solve for x
    x = 369,133.52/664.61
  6. Step 6: Final answer
    x = 555.42

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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.