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Finding the Fourth Proportional to 868.16, 1,199.74 and 658.17

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Solution

The fourth proportional to 868.16, 1,199.74 and 658.17 is: 909.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.16 : 1,199.74 = 658.17 : x
  2. Step 2: Convert to fraction form
    868.16/1,199.74 = 658.17/x
  3. Step 3: Cross multiply
    868.16x = 1,199.74 × 658.17
  4. Step 4: Simplify right side
    868.16x = 789,631.23
  5. Step 5: Solve for x
    x = 789,631.23/868.16
  6. Step 6: Final answer
    x = 909.54

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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.