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Finding the Fourth Proportional to 99,920.66, 137,631.81 and 69,651.86

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Solution

The fourth proportional to 99,920.66, 137,631.81 and 69,651.86 is: 95,939.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,920.66 : 137,631.81 = 69,651.86 : x
  2. Step 2: Convert to fraction form
    99,920.66/137,631.81 = 69,651.86/x
  3. Step 3: Cross multiply
    99,920.66x = 137,631.81 × 69,651.86
  4. Step 4: Simplify right side
    99,920.66x = 9,586,311,561.67
  5. Step 5: Solve for x
    x = 9,586,311,561.67/99,920.66
  6. Step 6: Final answer
    x = 95,939.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.