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Finding the Fourth Proportional to 1,238.52, 1,856.34 and 689.88

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Solution

The fourth proportional to 1,238.52, 1,856.34 and 689.88 is: 1,034.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.52 : 1,856.34 = 689.88 : x
  2. Step 2: Convert to fraction form
    1,238.52/1,856.34 = 689.88/x
  3. Step 3: Cross multiply
    1,238.52x = 1,856.34 × 689.88
  4. Step 4: Simplify right side
    1,238.52x = 1,280,651.84
  5. Step 5: Solve for x
    x = 1,280,651.84/1,238.52
  6. Step 6: Final answer
    x = 1,034.02

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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.