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Finding the Fourth Proportional to 1,251.36, 1,876.98 and 385.65

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Solution

The fourth proportional to 1,251.36, 1,876.98 and 385.65 is: 578.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.36 : 1,876.98 = 385.65 : x
  2. Step 2: Convert to fraction form
    1,251.36/1,876.98 = 385.65/x
  3. Step 3: Cross multiply
    1,251.36x = 1,876.98 × 385.65
  4. Step 4: Simplify right side
    1,251.36x = 723,857.34
  5. Step 5: Solve for x
    x = 723,857.34/1,251.36
  6. Step 6: Final answer
    x = 578.46

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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.