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Finding the Fourth Proportional to 99,535.80, 149,534.10 and 68,431.80

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Solution

The fourth proportional to 99,535.80, 149,534.10 and 68,431.80 is: 102,806.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,535.80 : 149,534.10 = 68,431.80 : x
  2. Step 2: Convert to fraction form
    99,535.80/149,534.10 = 68,431.80/x
  3. Step 3: Cross multiply
    99,535.80x = 149,534.10 × 68,431.80
  4. Step 4: Simplify right side
    99,535.80x = 10,232,887,624.38
  5. Step 5: Solve for x
    x = 10,232,887,624.38/99,535.80
  6. Step 6: Final answer
    x = 102,806.10

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1.5x scale

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.