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Finding the Fourth Proportional to 81,191.95, 121,785.18 and 28,600.06

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Solution

The fourth proportional to 81,191.95, 121,785.18 and 28,600.06 is: 42,899.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,191.95 : 121,785.18 = 28,600.06 : x
  2. Step 2: Convert to fraction form
    81,191.95/121,785.18 = 28,600.06/x
  3. Step 3: Cross multiply
    81,191.95x = 121,785.18 × 28,600.06
  4. Step 4: Simplify right side
    81,191.95x = 3,483,063,455.11
  5. Step 5: Solve for x
    x = 3,483,063,455.11/81,191.95
  6. Step 6: Final answer
    x = 42,899.12

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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.