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Finding the Fourth Proportional to 1,257.16, 1,883.80 and 639.92

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Solution

The fourth proportional to 1,257.16, 1,883.80 and 639.92 is: 958.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.16 : 1,883.80 = 639.92 : x
  2. Step 2: Convert to fraction form
    1,257.16/1,883.80 = 639.92/x
  3. Step 3: Cross multiply
    1,257.16x = 1,883.80 × 639.92
  4. Step 4: Simplify right side
    1,257.16x = 1,205,481.30
  5. Step 5: Solve for x
    x = 1,205,481.30/1,257.16
  6. Step 6: Final answer
    x = 958.89

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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.