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Finding the Fourth Proportional to 100,992.30, 151,488.45 and 81,309.30

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Solution

The fourth proportional to 100,992.30, 151,488.45 and 81,309.30 is: 121,963.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,992.30 : 151,488.45 = 81,309.30 : x
  2. Step 2: Convert to fraction form
    100,992.30/151,488.45 = 81,309.30/x
  3. Step 3: Cross multiply
    100,992.30x = 151,488.45 × 81,309.30
  4. Step 4: Simplify right side
    100,992.30x = 12,317,419,827.59
  5. Step 5: Solve for x
    x = 12,317,419,827.59/100,992.30
  6. Step 6: Final answer
    x = 121,963.95

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1.5x scale

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.