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Finding the Fourth Proportional to 1,120.61, 1,680.14 and 571.73

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Solution

The fourth proportional to 1,120.61, 1,680.14 and 571.73 is: 857.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.61 : 1,680.14 = 571.73 : x
  2. Step 2: Convert to fraction form
    1,120.61/1,680.14 = 571.73/x
  3. Step 3: Cross multiply
    1,120.61x = 1,680.14 × 571.73
  4. Step 4: Simplify right side
    1,120.61x = 960,586.44
  5. Step 5: Solve for x
    x = 960,586.44/1,120.61
  6. Step 6: Final answer
    x = 857.20

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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.