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Finding the Fourth Proportional to 1,253.43, 1,729.77 and 686.33

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Solution

The fourth proportional to 1,253.43, 1,729.77 and 686.33 is: 947.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.43 : 1,729.77 = 686.33 : x
  2. Step 2: Convert to fraction form
    1,253.43/1,729.77 = 686.33/x
  3. Step 3: Cross multiply
    1,253.43x = 1,729.77 × 686.33
  4. Step 4: Simplify right side
    1,253.43x = 1,187,184.40
  5. Step 5: Solve for x
    x = 1,187,184.40/1,253.43
  6. Step 6: Final answer
    x = 947.15

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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.