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Finding the Fourth Proportional to 1,128.67, 1,691.62 and 581.31

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Solution

The fourth proportional to 1,128.67, 1,691.62 and 581.31 is: 871.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.67 : 1,691.62 = 581.31 : x
  2. Step 2: Convert to fraction form
    1,128.67/1,691.62 = 581.31/x
  3. Step 3: Cross multiply
    1,128.67x = 1,691.62 × 581.31
  4. Step 4: Simplify right side
    1,128.67x = 983,354.17
  5. Step 5: Solve for x
    x = 983,354.17/1,128.67
  6. Step 6: Final answer
    x = 871.25

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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.