Home / 81,990.40-122,985.36-25,835.20

Finding the Fourth Proportional to 81,990.40, 122,985.36 and 25,835.20

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Solution

The fourth proportional to 81,990.40, 122,985.36 and 25,835.20 is: 38,752.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,990.40 : 122,985.36 = 25,835.20 : x
  2. Step 2: Convert to fraction form
    81,990.40/122,985.36 = 25,835.20/x
  3. Step 3: Cross multiply
    81,990.40x = 122,985.36 × 25,835.20
  4. Step 4: Simplify right side
    81,990.40x = 3,177,351,372.67
  5. Step 5: Solve for x
    x = 3,177,351,372.67/81,990.40
  6. Step 6: Final answer
    x = 38,752.72

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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.