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Finding the Fourth Proportional to 128,676, 193,117.68 and 66,364.32

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Solution

The fourth proportional to 128,676, 193,117.68 and 66,364.32 is: 99,599.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,676 : 193,117.68 = 66,364.32 : x
  2. Step 2: Convert to fraction form
    128,676/193,117.68 = 66,364.32/x
  3. Step 3: Cross multiply
    128,676x = 193,117.68 × 66,364.32
  4. Step 4: Simplify right side
    128,676x = 12,816,123,513.18
  5. Step 5: Solve for x
    x = 12,816,123,513.18/128,676
  6. Step 6: Final answer
    x = 99,599.95

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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.