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Finding the Fourth Proportional to 90,991.40, 136,422.30 and 34,809.80

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Solution

The fourth proportional to 90,991.40, 136,422.30 and 34,809.80 is: 52,189.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,991.40 : 136,422.30 = 34,809.80 : x
  2. Step 2: Convert to fraction form
    90,991.40/136,422.30 = 34,809.80/x
  3. Step 3: Cross multiply
    90,991.40x = 136,422.30 × 34,809.80
  4. Step 4: Simplify right side
    90,991.40x = 4,748,832,978.54
  5. Step 5: Solve for x
    x = 4,748,832,978.54/90,991.40
  6. Step 6: Final answer
    x = 52,189.91

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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.