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Finding the Fourth Proportional to 1,126.50, 1,687.19 and 920.76

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Solution

The fourth proportional to 1,126.50, 1,687.19 and 920.76 is: 1,379.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.50 : 1,687.19 = 920.76 : x
  2. Step 2: Convert to fraction form
    1,126.50/1,687.19 = 920.76/x
  3. Step 3: Cross multiply
    1,126.50x = 1,687.19 × 920.76
  4. Step 4: Simplify right side
    1,126.50x = 1,553,492.46
  5. Step 5: Solve for x
    x = 1,553,492.46/1,126.50
  6. Step 6: Final answer
    x = 1,379.04

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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.