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Finding the Fourth Proportional to 1,238.64, 1,856.52 and 689.88

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Solution

The fourth proportional to 1,238.64, 1,856.52 and 689.88 is: 1,034.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.64 : 1,856.52 = 689.88 : x
  2. Step 2: Convert to fraction form
    1,238.64/1,856.52 = 689.88/x
  3. Step 3: Cross multiply
    1,238.64x = 1,856.52 × 689.88
  4. Step 4: Simplify right side
    1,238.64x = 1,280,776.02
  5. Step 5: Solve for x
    x = 1,280,776.02/1,238.64
  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.