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Finding the Fourth Proportional to 81,003.60, 121,505.40 and 28,394.10

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Solution

The fourth proportional to 81,003.60, 121,505.40 and 28,394.10 is: 42,591.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,003.60 : 121,505.40 = 28,394.10 : x
  2. Step 2: Convert to fraction form
    81,003.60/121,505.40 = 28,394.10/x
  3. Step 3: Cross multiply
    81,003.60x = 121,505.40 × 28,394.10
  4. Step 4: Simplify right side
    81,003.60x = 3,450,036,478.14
  5. Step 5: Solve for x
    x = 3,450,036,478.14/81,003.60
  6. Step 6: Final answer
    x = 42,591.15

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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.