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Finding the Fourth Proportional to 980.12, 1,470.34 and 486.55

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Solution

The fourth proportional to 980.12, 1,470.34 and 486.55 is: 729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.12 : 1,470.34 = 486.55 : x
  2. Step 2: Convert to fraction form
    980.12/1,470.34 = 486.55/x
  3. Step 3: Cross multiply
    980.12x = 1,470.34 × 486.55
  4. Step 4: Simplify right side
    980.12x = 715,393.93
  5. Step 5: Solve for x
    x = 715,393.93/980.12
  6. Step 6: Final answer
    x = 729.90

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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.