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Finding the Fourth Proportional to 496.63, 686.17 and 392.51

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Solution

The fourth proportional to 496.63, 686.17 and 392.51 is: 542.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.63 : 686.17 = 392.51 : x
  2. Step 2: Convert to fraction form
    496.63/686.17 = 392.51/x
  3. Step 3: Cross multiply
    496.63x = 686.17 × 392.51
  4. Step 4: Simplify right side
    496.63x = 269,331.16
  5. Step 5: Solve for x
    x = 269,331.16/496.63
  6. Step 6: Final answer
    x = 542.32

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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.