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Finding the Fourth Proportional to 91,990.80, 137,986.20 and 56,998.80

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Solution

The fourth proportional to 91,990.80, 137,986.20 and 56,998.80 is: 85,498.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,990.80 : 137,986.20 = 56,998.80 : x
  2. Step 2: Convert to fraction form
    91,990.80/137,986.20 = 56,998.80/x
  3. Step 3: Cross multiply
    91,990.80x = 137,986.20 × 56,998.80
  4. Step 4: Simplify right side
    91,990.80x = 7,865,047,816.56
  5. Step 5: Solve for x
    x = 7,865,047,816.56/91,990.80
  6. Step 6: Final answer
    x = 85,498.20

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Similar ratio
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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.