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Finding the Fourth Proportional to 431,412.80, 647,119.20 and 221,460.80

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Solution

The fourth proportional to 431,412.80, 647,119.20 and 221,460.80 is: 332,191.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,412.80 : 647,119.20 = 221,460.80 : x
  2. Step 2: Convert to fraction form
    431,412.80/647,119.20 = 221,460.80/x
  3. Step 3: Cross multiply
    431,412.80x = 647,119.20 × 221,460.80
  4. Step 4: Simplify right side
    431,412.80x = 143,311,535,727.36
  5. Step 5: Solve for x
    x = 143,311,535,727.36/431,412.80
  6. Step 6: Final answer
    x = 332,191.20

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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.