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Finding the Fourth Proportional to 658.27, 907.65 and 492.21

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Solution

The fourth proportional to 658.27, 907.65 and 492.21 is: 678.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.27 : 907.65 = 492.21 : x
  2. Step 2: Convert to fraction form
    658.27/907.65 = 492.21/x
  3. Step 3: Cross multiply
    658.27x = 907.65 × 492.21
  4. Step 4: Simplify right side
    658.27x = 446,754.41
  5. Step 5: Solve for x
    x = 446,754.41/658.27
  6. Step 6: Final answer
    x = 678.68

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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.