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Finding the Fourth Proportional to 485.47, 727.29 and 387.97

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Solution

The fourth proportional to 485.47, 727.29 and 387.97 is: 581.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.47 : 727.29 = 387.97 : x
  2. Step 2: Convert to fraction form
    485.47/727.29 = 387.97/x
  3. Step 3: Cross multiply
    485.47x = 727.29 × 387.97
  4. Step 4: Simplify right side
    485.47x = 282,166.70
  5. Step 5: Solve for x
    x = 282,166.70/485.47
  6. Step 6: Final answer
    x = 581.22

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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.