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Finding the Fourth Proportional to 1,425.62, 1,966.81 and 865.88

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Solution

The fourth proportional to 1,425.62, 1,966.81 and 865.88 is: 1,194.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.62 : 1,966.81 = 865.88 : x
  2. Step 2: Convert to fraction form
    1,425.62/1,966.81 = 865.88/x
  3. Step 3: Cross multiply
    1,425.62x = 1,966.81 × 865.88
  4. Step 4: Simplify right side
    1,425.62x = 1,703,007.28
  5. Step 5: Solve for x
    x = 1,703,007.28/1,425.62
  6. Step 6: Final answer
    x = 1,194.58

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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.