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Finding the Fourth Proportional to 1,128.97, 1,691.35 and 581.48

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Solution

The fourth proportional to 1,128.97, 1,691.35 and 581.48 is: 871.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.97 : 1,691.35 = 581.48 : x
  2. Step 2: Convert to fraction form
    1,128.97/1,691.35 = 581.48/x
  3. Step 3: Cross multiply
    1,128.97x = 1,691.35 × 581.48
  4. Step 4: Simplify right side
    1,128.97x = 983,486.20
  5. Step 5: Solve for x
    x = 983,486.20/1,128.97
  6. Step 6: Final answer
    x = 871.14

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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.