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Finding the Fourth Proportional to 457.81, 631.81 and 271.20

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Solution

The fourth proportional to 457.81, 631.81 and 271.20 is: 374.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.81 : 631.81 = 271.20 : x
  2. Step 2: Convert to fraction form
    457.81/631.81 = 271.20/x
  3. Step 3: Cross multiply
    457.81x = 631.81 × 271.20
  4. Step 4: Simplify right side
    457.81x = 171,346.87
  5. Step 5: Solve for x
    x = 171,346.87/457.81
  6. Step 6: Final answer
    x = 374.28

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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.