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Finding the Fourth Proportional to 431,719.40, 647,579.10 and 342,489.80

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Solution

The fourth proportional to 431,719.40, 647,579.10 and 342,489.80 is: 513,734.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,719.40 : 647,579.10 = 342,489.80 : x
  2. Step 2: Convert to fraction form
    431,719.40/647,579.10 = 342,489.80/x
  3. Step 3: Cross multiply
    431,719.40x = 647,579.10 × 342,489.80
  4. Step 4: Simplify right side
    431,719.40x = 221,789,236,443.18
  5. Step 5: Solve for x
    x = 221,789,236,443.18/431,719.40
  6. Step 6: Final answer
    x = 513,734.70

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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.