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Finding the Fourth Proportional to 128,378.39, 192,407.18 and 61,800.71

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Solution

The fourth proportional to 128,378.39, 192,407.18 and 61,800.71 is: 92,623.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,378.39 : 192,407.18 = 61,800.71 : x
  2. Step 2: Convert to fraction form
    128,378.39/192,407.18 = 61,800.71/x
  3. Step 3: Cross multiply
    128,378.39x = 192,407.18 × 61,800.71
  4. Step 4: Simplify right side
    128,378.39x = 11,890,899,062.06
  5. Step 5: Solve for x
    x = 11,890,899,062.06/128,378.39
  6. Step 6: Final answer
    x = 92,623.84

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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.