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Finding the Fourth Proportional to 90,821.80, 136,086.90 and 59,620.60

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Solution

The fourth proportional to 90,821.80, 136,086.90 and 59,620.60 is: 89,335.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,821.80 : 136,086.90 = 59,620.60 : x
  2. Step 2: Convert to fraction form
    90,821.80/136,086.90 = 59,620.60/x
  3. Step 3: Cross multiply
    90,821.80x = 136,086.90 × 59,620.60
  4. Step 4: Simplify right side
    90,821.80x = 8,113,582,630.14
  5. Step 5: Solve for x
    x = 8,113,582,630.14/90,821.80
  6. Step 6: Final answer
    x = 89,335.19

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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.