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Finding the Fourth Proportional to 497.38, 686.69 and 320.43

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Solution

The fourth proportional to 497.38, 686.69 and 320.43 is: 442.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.38 : 686.69 = 320.43 : x
  2. Step 2: Convert to fraction form
    497.38/686.69 = 320.43/x
  3. Step 3: Cross multiply
    497.38x = 686.69 × 320.43
  4. Step 4: Simplify right side
    497.38x = 220,036.19
  5. Step 5: Solve for x
    x = 220,036.19/497.38
  6. Step 6: Final answer
    x = 442.39

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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.