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Finding the Fourth Proportional to 2,086.97, 3,129.98 and 788.13

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Solution

The fourth proportional to 2,086.97, 3,129.98 and 788.13 is: 1,182.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.97 : 3,129.98 = 788.13 : x
  2. Step 2: Convert to fraction form
    2,086.97/3,129.98 = 788.13/x
  3. Step 3: Cross multiply
    2,086.97x = 3,129.98 × 788.13
  4. Step 4: Simplify right side
    2,086.97x = 2,466,827.20
  5. Step 5: Solve for x
    x = 2,466,827.20/2,086.97
  6. Step 6: Final answer
    x = 1,182.02

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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.