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Finding the Fourth Proportional to 497.76, 686.72 and 342.64

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Solution

The fourth proportional to 497.76, 686.72 and 342.64 is: 472.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.76 : 686.72 = 342.64 : x
  2. Step 2: Convert to fraction form
    497.76/686.72 = 342.64/x
  3. Step 3: Cross multiply
    497.76x = 686.72 × 342.64
  4. Step 4: Simplify right side
    497.76x = 235,297.74
  5. Step 5: Solve for x
    x = 235,297.74/497.76
  6. Step 6: Final answer
    x = 472.71

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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.