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Finding the Fourth Proportional to 90,822.80, 136,234.20 and 68,704.40

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Solution

The fourth proportional to 90,822.80, 136,234.20 and 68,704.40 is: 103,056.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,822.80 : 136,234.20 = 68,704.40 : x
  2. Step 2: Convert to fraction form
    90,822.80/136,234.20 = 68,704.40/x
  3. Step 3: Cross multiply
    90,822.80x = 136,234.20 × 68,704.40
  4. Step 4: Simplify right side
    90,822.80x = 9,359,888,970.48
  5. Step 5: Solve for x
    x = 9,359,888,970.48/90,822.80
  6. Step 6: Final answer
    x = 103,056.60

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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.