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Finding the Fourth Proportional to 81,002.80, 121,504.20 and 61,319.80

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Solution

The fourth proportional to 81,002.80, 121,504.20 and 61,319.80 is: 91,979.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,002.80 : 121,504.20 = 61,319.80 : x
  2. Step 2: Convert to fraction form
    81,002.80/121,504.20 = 61,319.80/x
  3. Step 3: Cross multiply
    81,002.80x = 121,504.20 × 61,319.80
  4. Step 4: Simplify right side
    81,002.80x = 7,450,613,243.16
  5. Step 5: Solve for x
    x = 7,450,613,243.16/81,002.80
  6. Step 6: Final answer
    x = 91,979.70

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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.