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Finding the Fourth Proportional to 91,146.80, 136,660.80 and 81,815.60

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Solution

The fourth proportional to 91,146.80, 136,660.80 and 81,815.60 is: 122,670.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,146.80 : 136,660.80 = 81,815.60 : x
  2. Step 2: Convert to fraction form
    91,146.80/136,660.80 = 81,815.60/x
  3. Step 3: Cross multiply
    91,146.80x = 136,660.80 × 81,815.60
  4. Step 4: Simplify right side
    91,146.80x = 11,180,985,348.48
  5. Step 5: Solve for x
    x = 11,180,985,348.48/91,146.80
  6. Step 6: Final answer
    x = 122,670.08

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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.