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Finding the Fourth Proportional to 457.78, 686.63 and 165.27

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Solution

The fourth proportional to 457.78, 686.63 and 165.27 is: 247.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.78 : 686.63 = 165.27 : x
  2. Step 2: Convert to fraction form
    457.78/686.63 = 165.27/x
  3. Step 3: Cross multiply
    457.78x = 686.63 × 165.27
  4. Step 4: Simplify right side
    457.78x = 113,478.51
  5. Step 5: Solve for x
    x = 113,478.51/457.78
  6. Step 6: Final answer
    x = 247.89

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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.