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Finding the Fourth Proportional to 91,799.40, 137,990.70 and 86,550.60

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Solution

The fourth proportional to 91,799.40, 137,990.70 and 86,550.60 is: 130,100.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,799.40 : 137,990.70 = 86,550.60 : x
  2. Step 2: Convert to fraction form
    91,799.40/137,990.70 = 86,550.60/x
  3. Step 3: Cross multiply
    91,799.40x = 137,990.70 × 86,550.60
  4. Step 4: Simplify right side
    91,799.40x = 11,943,177,879.42
  5. Step 5: Solve for x
    x = 11,943,177,879.42/91,799.40
  6. Step 6: Final answer
    x = 130,100.83

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1.5x scale

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.