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Finding the Fourth Proportional to 1,125.70, 1,553.18 and 683.61

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Solution

The fourth proportional to 1,125.70, 1,553.18 and 683.61 is: 943.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.70 : 1,553.18 = 683.61 : x
  2. Step 2: Convert to fraction form
    1,125.70/1,553.18 = 683.61/x
  3. Step 3: Cross multiply
    1,125.70x = 1,553.18 × 683.61
  4. Step 4: Simplify right side
    1,125.70x = 1,061,760.14
  5. Step 5: Solve for x
    x = 1,061,760.14/1,125.70
  6. Step 6: Final answer
    x = 943.20

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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.