Home / 90,905.60-136,577.10-81,282.80

Finding the Fourth Proportional to 90,905.60, 136,577.10 and 81,282.80

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Solution

The fourth proportional to 90,905.60, 136,577.10 and 81,282.80 is: 122,119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,905.60 : 136,577.10 = 81,282.80 : x
  2. Step 2: Convert to fraction form
    90,905.60/136,577.10 = 81,282.80/x
  3. Step 3: Cross multiply
    90,905.60x = 136,577.10 × 81,282.80
  4. Step 4: Simplify right side
    90,905.60x = 11,101,369,103.88
  5. Step 5: Solve for x
    x = 11,101,369,103.88/90,905.60
  6. Step 6: Final answer
    x = 122,119.75

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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.