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Finding the Fourth Proportional to 1,129.90, 1,695.28 and 581.73

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Solution

The fourth proportional to 1,129.90, 1,695.28 and 581.73 is: 872.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.90 : 1,695.28 = 581.73 : x
  2. Step 2: Convert to fraction form
    1,129.90/1,695.28 = 581.73/x
  3. Step 3: Cross multiply
    1,129.90x = 1,695.28 × 581.73
  4. Step 4: Simplify right side
    1,129.90x = 986,198.05
  5. Step 5: Solve for x
    x = 986,198.05/1,129.90
  6. Step 6: Final answer
    x = 872.82

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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.