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Finding the Fourth Proportional to 431,679.60, 647,519.40 and 274,215.60

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Solution

The fourth proportional to 431,679.60, 647,519.40 and 274,215.60 is: 411,323.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,679.60 : 647,519.40 = 274,215.60 : x
  2. Step 2: Convert to fraction form
    431,679.60/647,519.40 = 274,215.60/x
  3. Step 3: Cross multiply
    431,679.60x = 647,519.40 × 274,215.60
  4. Step 4: Simplify right side
    431,679.60x = 177,559,920,782.64
  5. Step 5: Solve for x
    x = 177,559,920,782.64/431,679.60
  6. Step 6: Final answer
    x = 411,323.40

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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.