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Finding the Fourth Proportional to 868.40, 1,198.44 and 658.22

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Solution

The fourth proportional to 868.40, 1,198.44 and 658.22 is: 908.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.40 : 1,198.44 = 658.22 : x
  2. Step 2: Convert to fraction form
    868.40/1,198.44 = 658.22/x
  3. Step 3: Cross multiply
    868.40x = 1,198.44 × 658.22
  4. Step 4: Simplify right side
    868.40x = 788,837.18
  5. Step 5: Solve for x
    x = 788,837.18/868.40
  6. Step 6: Final answer
    x = 908.38

Related Problems

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Double scale
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1.5x scale

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.