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Finding the Fourth Proportional to 967.20, 1,447.20 and 643.20

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Solution

The fourth proportional to 967.20, 1,447.20 and 643.20 is: 962.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.20 : 1,447.20 = 643.20 : x
  2. Step 2: Convert to fraction form
    967.20/1,447.20 = 643.20/x
  3. Step 3: Cross multiply
    967.20x = 1,447.20 × 643.20
  4. Step 4: Simplify right side
    967.20x = 930,839.04
  5. Step 5: Solve for x
    x = 930,839.04/967.20
  6. Step 6: Final answer
    x = 962.41

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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.