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Finding the Fourth Proportional to 1,251.18, 1,876.77 and 520.75

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Solution

The fourth proportional to 1,251.18, 1,876.77 and 520.75 is: 781.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.18 : 1,876.77 = 520.75 : x
  2. Step 2: Convert to fraction form
    1,251.18/1,876.77 = 520.75/x
  3. Step 3: Cross multiply
    1,251.18x = 1,876.77 × 520.75
  4. Step 4: Simplify right side
    1,251.18x = 977,327.98
  5. Step 5: Solve for x
    x = 977,327.98/1,251.18
  6. Step 6: Final answer
    x = 781.13

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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.