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Finding the Fourth Proportional to 457.31, 686.31 and 279.46

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Solution

The fourth proportional to 457.31, 686.31 and 279.46 is: 419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.31 : 686.31 = 279.46 : x
  2. Step 2: Convert to fraction form
    457.31/686.31 = 279.46/x
  3. Step 3: Cross multiply
    457.31x = 686.31 × 279.46
  4. Step 4: Simplify right side
    457.31x = 191,796.19
  5. Step 5: Solve for x
    x = 191,796.19/457.31
  6. Step 6: Final answer
    x = 419.40

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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.