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Finding the Fourth Proportional to 1,251.27, 1,878.59 and 812.55

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Solution

The fourth proportional to 1,251.27, 1,878.59 and 812.55 is: 1,219.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.27 : 1,878.59 = 812.55 : x
  2. Step 2: Convert to fraction form
    1,251.27/1,878.59 = 812.55/x
  3. Step 3: Cross multiply
    1,251.27x = 1,878.59 × 812.55
  4. Step 4: Simplify right side
    1,251.27x = 1,526,444.24
  5. Step 5: Solve for x
    x = 1,526,444.24/1,251.27
  6. Step 6: Final answer
    x = 1,219.92

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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.