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Finding the Fourth Proportional to 1,151.69, 1,725.26 and 688.17

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Solution

The fourth proportional to 1,151.69, 1,725.26 and 688.17 is: 1,030.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.69 : 1,725.26 = 688.17 : x
  2. Step 2: Convert to fraction form
    1,151.69/1,725.26 = 688.17/x
  3. Step 3: Cross multiply
    1,151.69x = 1,725.26 × 688.17
  4. Step 4: Simplify right side
    1,151.69x = 1,187,272.17
  5. Step 5: Solve for x
    x = 1,187,272.17/1,151.69
  6. Step 6: Final answer
    x = 1,030.90

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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.