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Finding the Fourth Proportional to 1,251.54, 1,876.30 and 521.66

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Solution

The fourth proportional to 1,251.54, 1,876.30 and 521.66 is: 782.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.54 : 1,876.30 = 521.66 : x
  2. Step 2: Convert to fraction form
    1,251.54/1,876.30 = 521.66/x
  3. Step 3: Cross multiply
    1,251.54x = 1,876.30 × 521.66
  4. Step 4: Simplify right side
    1,251.54x = 978,794.04
  5. Step 5: Solve for x
    x = 978,794.04/1,251.54
  6. Step 6: Final answer
    x = 782.07

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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.