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Finding the Fourth Proportional to 408,877.46, 613,340.79 and 128,394.71

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Solution

The fourth proportional to 408,877.46, 613,340.79 and 128,394.71 is: 192,599.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,877.46 : 613,340.79 = 128,394.71 : x
  2. Step 2: Convert to fraction form
    408,877.46/613,340.79 = 128,394.71/x
  3. Step 3: Cross multiply
    408,877.46x = 613,340.79 × 128,394.71
  4. Step 4: Simplify right side
    408,877.46x = 78,749,709,315.04
  5. Step 5: Solve for x
    x = 78,749,709,315.04/408,877.46
  6. Step 6: Final answer
    x = 192,599.78

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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.