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Finding the Fourth Proportional to 1,251.70, 1,877.15 and 521.09

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Solution

The fourth proportional to 1,251.70, 1,877.15 and 521.09 is: 781.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.70 : 1,877.15 = 521.09 : x
  2. Step 2: Convert to fraction form
    1,251.70/1,877.15 = 521.09/x
  3. Step 3: Cross multiply
    1,251.70x = 1,877.15 × 521.09
  4. Step 4: Simplify right side
    1,251.70x = 978,164.09
  5. Step 5: Solve for x
    x = 978,164.09/1,251.70
  6. Step 6: Final answer
    x = 781.47

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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.