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Finding the Fourth Proportional to 775.40, 1,168.52 and 698.42

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Solution

The fourth proportional to 775.40, 1,168.52 and 698.42 is: 1,052.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.40 : 1,168.52 = 698.42 : x
  2. Step 2: Convert to fraction form
    775.40/1,168.52 = 698.42/x
  3. Step 3: Cross multiply
    775.40x = 1,168.52 × 698.42
  4. Step 4: Simplify right side
    775.40x = 816,117.74
  5. Step 5: Solve for x
    x = 816,117.74/775.40
  6. Step 6: Final answer
    x = 1,052.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.