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Finding the Fourth Proportional to 1,126.62, 1,553.24 and 861.22

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Solution

The fourth proportional to 1,126.62, 1,553.24 and 861.22 is: 1,187.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.62 : 1,553.24 = 861.22 : x
  2. Step 2: Convert to fraction form
    1,126.62/1,553.24 = 861.22/x
  3. Step 3: Cross multiply
    1,126.62x = 1,553.24 × 861.22
  4. Step 4: Simplify right side
    1,126.62x = 1,337,681.35
  5. Step 5: Solve for x
    x = 1,337,681.35/1,126.62
  6. Step 6: Final answer
    x = 1,187.34

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1.5x scale

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.