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Finding the Fourth Proportional to 1,126.26, 1,686.03 and 686.19

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Solution

The fourth proportional to 1,126.26, 1,686.03 and 686.19 is: 1,027.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.26 : 1,686.03 = 686.19 : x
  2. Step 2: Convert to fraction form
    1,126.26/1,686.03 = 686.19/x
  3. Step 3: Cross multiply
    1,126.26x = 1,686.03 × 686.19
  4. Step 4: Simplify right side
    1,126.26x = 1,156,936.93
  5. Step 5: Solve for x
    x = 1,156,936.93/1,126.26
  6. Step 6: Final answer
    x = 1,027.24

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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.