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Finding the Fourth Proportional to 99,710.80, 149,566.20 and 81,996.10

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Solution

The fourth proportional to 99,710.80, 149,566.20 and 81,996.10 is: 122,994.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,710.80 : 149,566.20 = 81,996.10 : x
  2. Step 2: Convert to fraction form
    99,710.80/149,566.20 = 81,996.10/x
  3. Step 3: Cross multiply
    99,710.80x = 149,566.20 × 81,996.10
  4. Step 4: Simplify right side
    99,710.80x = 12,263,845,091.82
  5. Step 5: Solve for x
    x = 12,263,845,091.82/99,710.80
  6. Step 6: Final answer
    x = 122,994.15

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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.