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Finding the Fourth Proportional to 1,229.80, 1,843.05 and 643.59

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Solution

The fourth proportional to 1,229.80, 1,843.05 and 643.59 is: 964.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.80 : 1,843.05 = 643.59 : x
  2. Step 2: Convert to fraction form
    1,229.80/1,843.05 = 643.59/x
  3. Step 3: Cross multiply
    1,229.80x = 1,843.05 × 643.59
  4. Step 4: Simplify right side
    1,229.80x = 1,186,168.55
  5. Step 5: Solve for x
    x = 1,186,168.55/1,229.80
  6. Step 6: Final answer
    x = 964.52

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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.