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Finding the Fourth Proportional to 86,990.83, 120,105.20 and 66,811.66

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Solution

The fourth proportional to 86,990.83, 120,105.20 and 66,811.66 is: 92,244.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,990.83 : 120,105.20 = 66,811.66 : x
  2. Step 2: Convert to fraction form
    86,990.83/120,105.20 = 66,811.66/x
  3. Step 3: Cross multiply
    86,990.83x = 120,105.20 × 66,811.66
  4. Step 4: Simplify right side
    86,990.83x = 8,024,427,653.40
  5. Step 5: Solve for x
    x = 8,024,427,653.40/86,990.83
  6. Step 6: Final answer
    x = 92,244.53

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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.