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Finding the Fourth Proportional to 906.97, 1,251.17 and 557.05

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Solution

The fourth proportional to 906.97, 1,251.17 and 557.05 is: 768.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.97 : 1,251.17 = 557.05 : x
  2. Step 2: Convert to fraction form
    906.97/1,251.17 = 557.05/x
  3. Step 3: Cross multiply
    906.97x = 1,251.17 × 557.05
  4. Step 4: Simplify right side
    906.97x = 696,959.39
  5. Step 5: Solve for x
    x = 696,959.39/906.97
  6. Step 6: Final answer
    x = 768.45

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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.