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Finding the Fourth Proportional to 1,251.79, 1,878.42 and 558.52

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Solution

The fourth proportional to 1,251.79, 1,878.42 and 558.52 is: 838.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.79 : 1,878.42 = 558.52 : x
  2. Step 2: Convert to fraction form
    1,251.79/1,878.42 = 558.52/x
  3. Step 3: Cross multiply
    1,251.79x = 1,878.42 × 558.52
  4. Step 4: Simplify right side
    1,251.79x = 1,049,135.14
  5. Step 5: Solve for x
    x = 1,049,135.14/1,251.79
  6. Step 6: Final answer
    x = 838.11

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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.