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Finding the Fourth Proportional to 431,381.20, 647,071.80 and 389,390.80

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Solution

The fourth proportional to 431,381.20, 647,071.80 and 389,390.80 is: 584,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,381.20 : 647,071.80 = 389,390.80 : x
  2. Step 2: Convert to fraction form
    431,381.20/647,071.80 = 389,390.80/x
  3. Step 3: Cross multiply
    431,381.20x = 647,071.80 × 389,390.80
  4. Step 4: Simplify right side
    431,381.20x = 251,963,805,859.44
  5. Step 5: Solve for x
    x = 251,963,805,859.44/431,381.20
  6. Step 6: Final answer
    x = 584,086.20

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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.