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Finding the Fourth Proportional to 712.80, 1,069.20 and 672.30

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Solution

The fourth proportional to 712.80, 1,069.20 and 672.30 is: 1,008.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.80 : 1,069.20 = 672.30 : x
  2. Step 2: Convert to fraction form
    712.80/1,069.20 = 672.30/x
  3. Step 3: Cross multiply
    712.80x = 1,069.20 × 672.30
  4. Step 4: Simplify right side
    712.80x = 718,823.16
  5. Step 5: Solve for x
    x = 718,823.16/712.80
  6. Step 6: Final answer
    x = 1,008.45

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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.