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Finding the Fourth Proportional to 1,425.97, 1,966.95 and 865.89

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Solution

The fourth proportional to 1,425.97, 1,966.95 and 865.89 is: 1,194.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.97 : 1,966.95 = 865.89 : x
  2. Step 2: Convert to fraction form
    1,425.97/1,966.95 = 865.89/x
  3. Step 3: Cross multiply
    1,425.97x = 1,966.95 × 865.89
  4. Step 4: Simplify right side
    1,425.97x = 1,703,162.34
  5. Step 5: Solve for x
    x = 1,703,162.34/1,425.97
  6. Step 6: Final answer
    x = 1,194.39

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1.5x scale

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.