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Finding the Fourth Proportional to 1,182.43, 1,631.91 and 851.95

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Solution

The fourth proportional to 1,182.43, 1,631.91 and 851.95 is: 1,175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,182.43 : 1,631.91 = 851.95 : x
  2. Step 2: Convert to fraction form
    1,182.43/1,631.91 = 851.95/x
  3. Step 3: Cross multiply
    1,182.43x = 1,631.91 × 851.95
  4. Step 4: Simplify right side
    1,182.43x = 1,390,305.72
  5. Step 5: Solve for x
    x = 1,390,305.72/1,182.43
  6. Step 6: Final answer
    x = 1,175.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.