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Finding the Fourth Proportional to 408,889.66, 613,433.31 and 128,406.90

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Solution

The fourth proportional to 408,889.66, 613,433.31 and 128,406.90 is: 192,641.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,889.66 : 613,433.31 = 128,406.90 : x
  2. Step 2: Convert to fraction form
    408,889.66/613,433.31 = 128,406.90/x
  3. Step 3: Cross multiply
    408,889.66x = 613,433.31 × 128,406.90
  4. Step 4: Simplify right side
    408,889.66x = 78,769,069,693.84
  5. Step 5: Solve for x
    x = 78,769,069,693.84/408,889.66
  6. Step 6: Final answer
    x = 192,641.38

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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.