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Finding the Fourth Proportional to 1,066.20, 1,469.97 and 771.54

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Solution

The fourth proportional to 1,066.20, 1,469.97 and 771.54 is: 1,063.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,066.20 : 1,469.97 = 771.54 : x
  2. Step 2: Convert to fraction form
    1,066.20/1,469.97 = 771.54/x
  3. Step 3: Cross multiply
    1,066.20x = 1,469.97 × 771.54
  4. Step 4: Simplify right side
    1,066.20x = 1,134,140.65
  5. Step 5: Solve for x
    x = 1,134,140.65/1,066.20
  6. Step 6: Final answer
    x = 1,063.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.