Home / 91,728.20-137,592.30-81,705.80

Finding the Fourth Proportional to 91,728.20, 137,592.30 and 81,705.80

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Solution

The fourth proportional to 91,728.20, 137,592.30 and 81,705.80 is: 122,558.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,728.20 : 137,592.30 = 81,705.80 : x
  2. Step 2: Convert to fraction form
    91,728.20/137,592.30 = 81,705.80/x
  3. Step 3: Cross multiply
    91,728.20x = 137,592.30 × 81,705.80
  4. Step 4: Simplify right side
    91,728.20x = 11,242,088,945.34
  5. Step 5: Solve for x
    x = 11,242,088,945.34/91,728.20
  6. Step 6: Final answer
    x = 122,558.70

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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.