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Finding the Fourth Proportional to 477.12, 658.40 and 321.92

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Solution

The fourth proportional to 477.12, 658.40 and 321.92 is: 444.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.12 : 658.40 = 321.92 : x
  2. Step 2: Convert to fraction form
    477.12/658.40 = 321.92/x
  3. Step 3: Cross multiply
    477.12x = 658.40 × 321.92
  4. Step 4: Simplify right side
    477.12x = 211,952.13
  5. Step 5: Solve for x
    x = 211,952.13/477.12
  6. Step 6: Final answer
    x = 444.23

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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.