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Finding the Fourth Proportional to 90,821.80, 136,232.70 and 61,078.60

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Solution

The fourth proportional to 90,821.80, 136,232.70 and 61,078.60 is: 91,617.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,821.80 : 136,232.70 = 61,078.60 : x
  2. Step 2: Convert to fraction form
    90,821.80/136,232.70 = 61,078.60/x
  3. Step 3: Cross multiply
    90,821.80x = 136,232.70 × 61,078.60
  4. Step 4: Simplify right side
    90,821.80x = 8,320,902,590.22
  5. Step 5: Solve for x
    x = 8,320,902,590.22/90,821.80
  6. Step 6: Final answer
    x = 91,617.90

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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.