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Finding the Fourth Proportional to 980.67, 1,470.72 and 672.45

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Solution

The fourth proportional to 980.67, 1,470.72 and 672.45 is: 1,008.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.67 : 1,470.72 = 672.45 : x
  2. Step 2: Convert to fraction form
    980.67/1,470.72 = 672.45/x
  3. Step 3: Cross multiply
    980.67x = 1,470.72 × 672.45
  4. Step 4: Simplify right side
    980.67x = 988,985.66
  5. Step 5: Solve for x
    x = 988,985.66/980.67
  6. Step 6: Final answer
    x = 1,008.48

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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.