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Finding the Fourth Proportional to 1,129.52, 1,690.72 and 836.84

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Solution

The fourth proportional to 1,129.52, 1,690.72 and 836.84 is: 1,252.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.52 : 1,690.72 = 836.84 : x
  2. Step 2: Convert to fraction form
    1,129.52/1,690.72 = 836.84/x
  3. Step 3: Cross multiply
    1,129.52x = 1,690.72 × 836.84
  4. Step 4: Simplify right side
    1,129.52x = 1,414,862.12
  5. Step 5: Solve for x
    x = 1,414,862.12/1,129.52
  6. Step 6: Final answer
    x = 1,252.62

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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.