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Finding the Fourth Proportional to 1,253.90, 1,730.33 and 686.73

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Solution

The fourth proportional to 1,253.90, 1,730.33 and 686.73 is: 947.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.90 : 1,730.33 = 686.73 : x
  2. Step 2: Convert to fraction form
    1,253.90/1,730.33 = 686.73/x
  3. Step 3: Cross multiply
    1,253.90x = 1,730.33 × 686.73
  4. Step 4: Simplify right side
    1,253.90x = 1,188,269.52
  5. Step 5: Solve for x
    x = 1,188,269.52/1,253.90
  6. Step 6: Final answer
    x = 947.66

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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.