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Finding the Fourth Proportional to 457.18, 631 and 282.68

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Solution

The fourth proportional to 457.18, 631 and 282.68 is: 390.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.18 : 631 = 282.68 : x
  2. Step 2: Convert to fraction form
    457.18/631 = 282.68/x
  3. Step 3: Cross multiply
    457.18x = 631 × 282.68
  4. Step 4: Simplify right side
    457.18x = 178,371.08
  5. Step 5: Solve for x
    x = 178,371.08/457.18
  6. Step 6: Final answer
    x = 390.16

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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.