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Finding the Fourth Proportional to 431,616.80, 647,425.20 and 423,322.40

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Solution

The fourth proportional to 431,616.80, 647,425.20 and 423,322.40 is: 634,983.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,616.80 : 647,425.20 = 423,322.40 : x
  2. Step 2: Convert to fraction form
    431,616.80/647,425.20 = 423,322.40/x
  3. Step 3: Cross multiply
    431,616.80x = 647,425.20 × 423,322.40
  4. Step 4: Simplify right side
    431,616.80x = 274,069,589,484.48
  5. Step 5: Solve for x
    x = 274,069,589,484.48/431,616.80
  6. Step 6: Final answer
    x = 634,983.60

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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.