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Finding the Fourth Proportional to 408,909.90, 613,364.85 and 128,426.70

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Solution

The fourth proportional to 408,909.90, 613,364.85 and 128,426.70 is: 192,640.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,909.90 : 613,364.85 = 128,426.70 : x
  2. Step 2: Convert to fraction form
    408,909.90/613,364.85 = 128,426.70/x
  3. Step 3: Cross multiply
    408,909.90x = 613,364.85 × 128,426.70
  4. Step 4: Simplify right side
    408,909.90x = 78,772,423,581.50
  5. Step 5: Solve for x
    x = 78,772,423,581.50/408,909.90
  6. Step 6: Final answer
    x = 192,640.05

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Similar ratio
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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.