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Finding the Fourth Proportional to 1,256.38, 1,884.30 and 331.90

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Solution

The fourth proportional to 1,256.38, 1,884.30 and 331.90 is: 497.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.38 : 1,884.30 = 331.90 : x
  2. Step 2: Convert to fraction form
    1,256.38/1,884.30 = 331.90/x
  3. Step 3: Cross multiply
    1,256.38x = 1,884.30 × 331.90
  4. Step 4: Simplify right side
    1,256.38x = 625,393.21
  5. Step 5: Solve for x
    x = 625,393.21/1,256.38
  6. Step 6: Final answer
    x = 497.77

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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.