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Finding the Fourth Proportional to 639,436.80, 959,932.80 and 323,731.20

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Solution

The fourth proportional to 639,436.80, 959,932.80 and 323,731.20 is: 485,990.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,436.80 : 959,932.80 = 323,731.20 : x
  2. Step 2: Convert to fraction form
    639,436.80/959,932.80 = 323,731.20/x
  3. Step 3: Cross multiply
    639,436.80x = 959,932.80 × 323,731.20
  4. Step 4: Simplify right side
    639,436.80x = 310,760,197,263.36
  5. Step 5: Solve for x
    x = 310,760,197,263.36/639,436.80
  6. Step 6: Final answer
    x = 485,990.48

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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.