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Finding the Fourth Proportional to 457.81, 686.65 and 165.26

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Solution

The fourth proportional to 457.81, 686.65 and 165.26 is: 247.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.81 : 686.65 = 165.26 : x
  2. Step 2: Convert to fraction form
    457.81/686.65 = 165.26/x
  3. Step 3: Cross multiply
    457.81x = 686.65 × 165.26
  4. Step 4: Simplify right side
    457.81x = 113,474.40
  5. Step 5: Solve for x
    x = 113,474.40/457.81
  6. Step 6: Final answer
    x = 247.86

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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.