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Finding the Fourth Proportional to 118,221.12, 163,143.72 and 67,920.12

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Solution

The fourth proportional to 118,221.12, 163,143.72 and 67,920.12 is: 93,728.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,221.12 : 163,143.72 = 67,920.12 : x
  2. Step 2: Convert to fraction form
    118,221.12/163,143.72 = 67,920.12/x
  3. Step 3: Cross multiply
    118,221.12x = 163,143.72 × 67,920.12
  4. Step 4: Simplify right side
    118,221.12x = 11,080,741,039.65
  5. Step 5: Solve for x
    x = 11,080,741,039.65/118,221.12
  6. Step 6: Final answer
    x = 93,728.95

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1.5x scale

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.