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Finding the Fourth Proportional to 81,064.80, 121,402.80 and 65,512.80

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Solution

The fourth proportional to 81,064.80, 121,402.80 and 65,512.80 is: 98,112.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,064.80 : 121,402.80 = 65,512.80 : x
  2. Step 2: Convert to fraction form
    81,064.80/121,402.80 = 65,512.80/x
  3. Step 3: Cross multiply
    81,064.80x = 121,402.80 × 65,512.80
  4. Step 4: Simplify right side
    81,064.80x = 7,953,437,355.84
  5. Step 5: Solve for x
    x = 7,953,437,355.84/81,064.80
  6. Step 6: Final answer
    x = 98,112.09

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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.