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Finding the Fourth Proportional to 1,257.26, 1,886.68 and 487.76

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Solution

The fourth proportional to 1,257.26, 1,886.68 and 487.76 is: 731.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.26 : 1,886.68 = 487.76 : x
  2. Step 2: Convert to fraction form
    1,257.26/1,886.68 = 487.76/x
  3. Step 3: Cross multiply
    1,257.26x = 1,886.68 × 487.76
  4. Step 4: Simplify right side
    1,257.26x = 920,247.04
  5. Step 5: Solve for x
    x = 920,247.04/1,257.26
  6. Step 6: Final answer
    x = 731.95

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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.