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Finding the Fourth Proportional to 1,251.90, 1,877.85 and 668.70

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Solution

The fourth proportional to 1,251.90, 1,877.85 and 668.70 is: 1,003.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.90 : 1,877.85 = 668.70 : x
  2. Step 2: Convert to fraction form
    1,251.90/1,877.85 = 668.70/x
  3. Step 3: Cross multiply
    1,251.90x = 1,877.85 × 668.70
  4. Step 4: Simplify right side
    1,251.90x = 1,255,718.30
  5. Step 5: Solve for x
    x = 1,255,718.30/1,251.90
  6. Step 6: Final answer
    x = 1,003.05

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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.