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Finding the Fourth Proportional to 980.84, 1,470.25 and 615.88

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Solution

The fourth proportional to 980.84, 1,470.25 and 615.88 is: 923.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.84 : 1,470.25 = 615.88 : x
  2. Step 2: Convert to fraction form
    980.84/1,470.25 = 615.88/x
  3. Step 3: Cross multiply
    980.84x = 1,470.25 × 615.88
  4. Step 4: Simplify right side
    980.84x = 905,497.57
  5. Step 5: Solve for x
    x = 905,497.57/980.84
  6. Step 6: Final answer
    x = 923.19

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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.