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Finding the Fourth Proportional to 90,745.80, 136,118.70 and 81,232.35

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Solution

The fourth proportional to 90,745.80, 136,118.70 and 81,232.35 is: 121,848.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,745.80 : 136,118.70 = 81,232.35 : x
  2. Step 2: Convert to fraction form
    90,745.80/136,118.70 = 81,232.35/x
  3. Step 3: Cross multiply
    90,745.80x = 136,118.70 × 81,232.35
  4. Step 4: Simplify right side
    90,745.80x = 11,057,241,879.95
  5. Step 5: Solve for x
    x = 11,057,241,879.95/90,745.80
  6. Step 6: Final answer
    x = 121,848.53

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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.