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Finding the Fourth Proportional to 81,393.55, 121,985.21 and 65,605.87

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Solution

The fourth proportional to 81,393.55, 121,985.21 and 65,605.87 is: 98,324.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,393.55 : 121,985.21 = 65,605.87 : x
  2. Step 2: Convert to fraction form
    81,393.55/121,985.21 = 65,605.87/x
  3. Step 3: Cross multiply
    81,393.55x = 121,985.21 × 65,605.87
  4. Step 4: Simplify right side
    81,393.55x = 8,002,945,501.15
  5. Step 5: Solve for x
    x = 8,002,945,501.15/81,393.55
  6. Step 6: Final answer
    x = 98,324.07

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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.