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Finding the Fourth Proportional to 1,126.55, 1,686.54 and 751.72

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Solution

The fourth proportional to 1,126.55, 1,686.54 and 751.72 is: 1,125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.55 : 1,686.54 = 751.72 : x
  2. Step 2: Convert to fraction form
    1,126.55/1,686.54 = 751.72/x
  3. Step 3: Cross multiply
    1,126.55x = 1,686.54 × 751.72
  4. Step 4: Simplify right side
    1,126.55x = 1,267,805.14
  5. Step 5: Solve for x
    x = 1,267,805.14/1,126.55
  6. Step 6: Final answer
    x = 1,125.39

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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.