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Finding the Fourth Proportional to 99,661.80, 149,723.10 and 68,557.80

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Solution

The fourth proportional to 99,661.80, 149,723.10 and 68,557.80 is: 102,995.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,661.80 : 149,723.10 = 68,557.80 : x
  2. Step 2: Convert to fraction form
    99,661.80/149,723.10 = 68,557.80/x
  3. Step 3: Cross multiply
    99,661.80x = 149,723.10 × 68,557.80
  4. Step 4: Simplify right side
    99,661.80x = 10,264,686,345.18
  5. Step 5: Solve for x
    x = 10,264,686,345.18/99,661.80
  6. Step 6: Final answer
    x = 102,995.19

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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.