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Finding the Fourth Proportional to 980.32, 1,470.17 and 287.04

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Solution

The fourth proportional to 980.32, 1,470.17 and 287.04 is: 430.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.32 : 1,470.17 = 287.04 : x
  2. Step 2: Convert to fraction form
    980.32/1,470.17 = 287.04/x
  3. Step 3: Cross multiply
    980.32x = 1,470.17 × 287.04
  4. Step 4: Simplify right side
    980.32x = 421,997.60
  5. Step 5: Solve for x
    x = 421,997.60/980.32
  6. Step 6: Final answer
    x = 430.47

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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.