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Finding the Fourth Proportional to 1,154.69, 1,731.37 and 686.36

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Solution

The fourth proportional to 1,154.69, 1,731.37 and 686.36 is: 1,029.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,154.69 : 1,731.37 = 686.36 : x
  2. Step 2: Convert to fraction form
    1,154.69/1,731.37 = 686.36/x
  3. Step 3: Cross multiply
    1,154.69x = 1,731.37 × 686.36
  4. Step 4: Simplify right side
    1,154.69x = 1,188,332.74
  5. Step 5: Solve for x
    x = 1,188,332.74/1,154.69
  6. Step 6: Final answer
    x = 1,029.14

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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.