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Finding the Fourth Proportional to 980.43, 1,470.27 and 864.99

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Solution

The fourth proportional to 980.43, 1,470.27 and 864.99 is: 1,297.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.43 : 1,470.27 = 864.99 : x
  2. Step 2: Convert to fraction form
    980.43/1,470.27 = 864.99/x
  3. Step 3: Cross multiply
    980.43x = 1,470.27 × 864.99
  4. Step 4: Simplify right side
    980.43x = 1,271,768.85
  5. Step 5: Solve for x
    x = 1,271,768.85/980.43
  6. Step 6: Final answer
    x = 1,297.15

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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.