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Finding the Fourth Proportional to 497.61, 686.94 and 311.31

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Solution

The fourth proportional to 497.61, 686.94 and 311.31 is: 429.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.61 : 686.94 = 311.31 : x
  2. Step 2: Convert to fraction form
    497.61/686.94 = 311.31/x
  3. Step 3: Cross multiply
    497.61x = 686.94 × 311.31
  4. Step 4: Simplify right side
    497.61x = 213,851.29
  5. Step 5: Solve for x
    x = 213,851.29/497.61
  6. Step 6: Final answer
    x = 429.76

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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.