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Finding the Fourth Proportional to 81,253.20, 121,661.10 and 81,253.20

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Solution

The fourth proportional to 81,253.20, 121,661.10 and 81,253.20 is: 121,661.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,253.20 : 121,661.10 = 81,253.20 : x
  2. Step 2: Convert to fraction form
    81,253.20/121,661.10 = 81,253.20/x
  3. Step 3: Cross multiply
    81,253.20x = 121,661.10 × 81,253.20
  4. Step 4: Simplify right side
    81,253.20x = 9,885,353,690.52
  5. Step 5: Solve for x
    x = 9,885,353,690.52/81,253.20
  6. Step 6: Final answer
    x = 121,661.10

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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.