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Finding the Fourth Proportional to 431,404.80, 647,107.20 and 397,287.60

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Solution

The fourth proportional to 431,404.80, 647,107.20 and 397,287.60 is: 595,931.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,404.80 : 647,107.20 = 397,287.60 : x
  2. Step 2: Convert to fraction form
    431,404.80/647,107.20 = 397,287.60/x
  3. Step 3: Cross multiply
    431,404.80x = 647,107.20 × 397,287.60
  4. Step 4: Simplify right side
    431,404.80x = 257,087,666,430.72
  5. Step 5: Solve for x
    x = 257,087,666,430.72/431,404.80
  6. Step 6: Final answer
    x = 595,931.40

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Similar ratio
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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.