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Finding the Fourth Proportional to 81,171.90, 121,774.59 and 28,618.02

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Solution

The fourth proportional to 81,171.90, 121,774.59 and 28,618.02 is: 42,932.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,171.90 : 121,774.59 = 28,618.02 : x
  2. Step 2: Convert to fraction form
    81,171.90/121,774.59 = 28,618.02/x
  3. Step 3: Cross multiply
    81,171.90x = 121,774.59 × 28,618.02
  4. Step 4: Simplify right side
    81,171.90x = 3,484,947,652.11
  5. Step 5: Solve for x
    x = 3,484,947,652.11/81,171.90
  6. Step 6: Final answer
    x = 42,932.93

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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.