Home / 1,331.52-1,983.90-1,257

Finding the Fourth Proportional to 1,331.52, 1,983.90 and 1,257

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Solution

The fourth proportional to 1,331.52, 1,983.90 and 1,257 is: 1,872.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.52 : 1,983.90 = 1,257 : x
  2. Step 2: Convert to fraction form
    1,331.52/1,983.90 = 1,257/x
  3. Step 3: Cross multiply
    1,331.52x = 1,983.90 × 1,257
  4. Step 4: Simplify right side
    1,331.52x = 2,493,762.30
  5. Step 5: Solve for x
    x = 2,493,762.30/1,331.52
  6. Step 6: Final answer
    x = 1,872.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.