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Finding the Fourth Proportional to 431,479.56, 647,244.85 and 131,980.84

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Solution

The fourth proportional to 431,479.56, 647,244.85 and 131,980.84 is: 197,979.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,479.56 : 647,244.85 = 131,980.84 : x
  2. Step 2: Convert to fraction form
    431,479.56/647,244.85 = 131,980.84/x
  3. Step 3: Cross multiply
    431,479.56x = 647,244.85 × 131,980.84
  4. Step 4: Simplify right side
    431,479.56x = 85,423,921,300.02
  5. Step 5: Solve for x
    x = 85,423,921,300.02/431,479.56
  6. Step 6: Final answer
    x = 197,979.07

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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.