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Finding the Fourth Proportional to 98,117.85, 135,443.78 and 66,329.81

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Solution

The fourth proportional to 98,117.85, 135,443.78 and 66,329.81 is: 91,562.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,117.85 : 135,443.78 = 66,329.81 : x
  2. Step 2: Convert to fraction form
    98,117.85/135,443.78 = 66,329.81/x
  3. Step 3: Cross multiply
    98,117.85x = 135,443.78 × 66,329.81
  4. Step 4: Simplify right side
    98,117.85x = 8,983,960,193.08
  5. Step 5: Solve for x
    x = 8,983,960,193.08/98,117.85
  6. Step 6: Final answer
    x = 91,562.95

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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.