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Finding the Fourth Proportional to 980.11, 1,470.27 and 286.79

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Solution

The fourth proportional to 980.11, 1,470.27 and 286.79 is: 430.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.11 : 1,470.27 = 286.79 : x
  2. Step 2: Convert to fraction form
    980.11/1,470.27 = 286.79/x
  3. Step 3: Cross multiply
    980.11x = 1,470.27 × 286.79
  4. Step 4: Simplify right side
    980.11x = 421,653.93
  5. Step 5: Solve for x
    x = 421,653.93/980.11
  6. Step 6: Final answer
    x = 430.21

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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.