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Finding the Fourth Proportional to 485.97, 728.42 and 319.52

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Solution

The fourth proportional to 485.97, 728.42 and 319.52 is: 478.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.97 : 728.42 = 319.52 : x
  2. Step 2: Convert to fraction form
    485.97/728.42 = 319.52/x
  3. Step 3: Cross multiply
    485.97x = 728.42 × 319.52
  4. Step 4: Simplify right side
    485.97x = 232,743.16
  5. Step 5: Solve for x
    x = 232,743.16/485.97
  6. Step 6: Final answer
    x = 478.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.