Home / 1,251.31-1,876.95-385.60

Finding the Fourth Proportional to 1,251.31, 1,876.95 and 385.60

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Solution

The fourth proportional to 1,251.31, 1,876.95 and 385.60 is: 578.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.31 : 1,876.95 = 385.60 : x
  2. Step 2: Convert to fraction form
    1,251.31/1,876.95 = 385.60/x
  3. Step 3: Cross multiply
    1,251.31x = 1,876.95 × 385.60
  4. Step 4: Simplify right side
    1,251.31x = 723,751.92
  5. Step 5: Solve for x
    x = 723,751.92/1,251.31
  6. Step 6: Final answer
    x = 578.40

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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.