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Finding the Fourth Proportional to 1,125.66, 1,553.13 and 683.55

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Solution

The fourth proportional to 1,125.66, 1,553.13 and 683.55 is: 943.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.66 : 1,553.13 = 683.55 : x
  2. Step 2: Convert to fraction form
    1,125.66/1,553.13 = 683.55/x
  3. Step 3: Cross multiply
    1,125.66x = 1,553.13 × 683.55
  4. Step 4: Simplify right side
    1,125.66x = 1,061,642.01
  5. Step 5: Solve for x
    x = 1,061,642.01/1,125.66
  6. Step 6: Final answer
    x = 943.13

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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.