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Finding the Fourth Proportional to 86,988.96, 120,102.59 and 66,809.79

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Solution

The fourth proportional to 86,988.96, 120,102.59 and 66,809.79 is: 92,241.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,988.96 : 120,102.59 = 66,809.79 : x
  2. Step 2: Convert to fraction form
    86,988.96/120,102.59 = 66,809.79/x
  3. Step 3: Cross multiply
    86,988.96x = 120,102.59 × 66,809.79
  4. Step 4: Simplify right side
    86,988.96x = 8,024,028,816.36
  5. Step 5: Solve for x
    x = 8,024,028,816.36/86,988.96
  6. Step 6: Final answer
    x = 92,241.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.