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Finding the Fourth Proportional to 431,990.80, 647,899.80 and 207,350.80

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Solution

The fourth proportional to 431,990.80, 647,899.80 and 207,350.80 is: 310,984.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,990.80 : 647,899.80 = 207,350.80 : x
  2. Step 2: Convert to fraction form
    431,990.80/647,899.80 = 207,350.80/x
  3. Step 3: Cross multiply
    431,990.80x = 647,899.80 × 207,350.80
  4. Step 4: Simplify right side
    431,990.80x = 134,342,541,849.84
  5. Step 5: Solve for x
    x = 134,342,541,849.84/431,990.80
  6. Step 6: Final answer
    x = 310,984.73

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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.