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Finding the Fourth Proportional to 1,251.82, 1,878.58 and 521.38

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Solution

The fourth proportional to 1,251.82, 1,878.58 and 521.38 is: 782.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.82 : 1,878.58 = 521.38 : x
  2. Step 2: Convert to fraction form
    1,251.82/1,878.58 = 521.38/x
  3. Step 3: Cross multiply
    1,251.82x = 1,878.58 × 521.38
  4. Step 4: Simplify right side
    1,251.82x = 979,454.04
  5. Step 5: Solve for x
    x = 979,454.04/1,251.82
  6. Step 6: Final answer
    x = 782.42

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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.