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Finding the Fourth Proportional to 457.75, 631.28 and 409.15

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Solution

The fourth proportional to 457.75, 631.28 and 409.15 is: 564.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.75 : 631.28 = 409.15 : x
  2. Step 2: Convert to fraction form
    457.75/631.28 = 409.15/x
  3. Step 3: Cross multiply
    457.75x = 631.28 × 409.15
  4. Step 4: Simplify right side
    457.75x = 258,283.01
  5. Step 5: Solve for x
    x = 258,283.01/457.75
  6. Step 6: Final answer
    x = 564.25

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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.