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Finding the Fourth Proportional to 694.20, 987.06 and 694.20

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Solution

The fourth proportional to 694.20, 987.06 and 694.20 is: 987.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.20 : 987.06 = 694.20 : x
  2. Step 2: Convert to fraction form
    694.20/987.06 = 694.20/x
  3. Step 3: Cross multiply
    694.20x = 987.06 × 694.20
  4. Step 4: Simplify right side
    694.20x = 685,217.05
  5. Step 5: Solve for x
    x = 685,217.05/694.20
  6. Step 6: Final answer
    x = 987.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.