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Finding the Fourth Proportional to 980.61, 1,470.76 and 287.11

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Solution

The fourth proportional to 980.61, 1,470.76 and 287.11 is: 430.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.61 : 1,470.76 = 287.11 : x
  2. Step 2: Convert to fraction form
    980.61/1,470.76 = 287.11/x
  3. Step 3: Cross multiply
    980.61x = 1,470.76 × 287.11
  4. Step 4: Simplify right side
    980.61x = 422,272.86
  5. Step 5: Solve for x
    x = 422,272.86/980.61
  6. Step 6: Final answer
    x = 430.62

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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.