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Finding the Fourth Proportional to 86,989.96, 120,103.97 and 66,810.79

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Solution

The fourth proportional to 86,989.96, 120,103.97 and 66,810.79 is: 92,243.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,989.96 : 120,103.97 = 66,810.79 : x
  2. Step 2: Convert to fraction form
    86,989.96/120,103.97 = 66,810.79/x
  3. Step 3: Cross multiply
    86,989.96x = 120,103.97 × 66,810.79
  4. Step 4: Simplify right side
    86,989.96x = 8,024,241,117.84
  5. Step 5: Solve for x
    x = 8,024,241,117.84/86,989.96
  6. Step 6: Final answer
    x = 92,243.30

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1.5x scale

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.