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Finding the Fourth Proportional to 457.92, 631.68 and 393.28

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Solution

The fourth proportional to 457.92, 631.68 and 393.28 is: 542.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.92 : 631.68 = 393.28 : x
  2. Step 2: Convert to fraction form
    457.92/631.68 = 393.28/x
  3. Step 3: Cross multiply
    457.92x = 631.68 × 393.28
  4. Step 4: Simplify right side
    457.92x = 248,427.11
  5. Step 5: Solve for x
    x = 248,427.11/457.92
  6. Step 6: Final answer
    x = 542.51

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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.