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Finding the Fourth Proportional to 408,628.80, 612,943.20 and 319,958.10

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Solution

The fourth proportional to 408,628.80, 612,943.20 and 319,958.10 is: 479,937.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,628.80 : 612,943.20 = 319,958.10 : x
  2. Step 2: Convert to fraction form
    408,628.80/612,943.20 = 319,958.10/x
  3. Step 3: Cross multiply
    408,628.80x = 612,943.20 × 319,958.10
  4. Step 4: Simplify right side
    408,628.80x = 196,116,141,679.92
  5. Step 5: Solve for x
    x = 196,116,141,679.92/408,628.80
  6. Step 6: Final answer
    x = 479,937.15

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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.