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Finding the Fourth Proportional to 858.42, 1,185.75 and 658.04

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Solution

The fourth proportional to 858.42, 1,185.75 and 658.04 is: 908.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.42 : 1,185.75 = 658.04 : x
  2. Step 2: Convert to fraction form
    858.42/1,185.75 = 658.04/x
  3. Step 3: Cross multiply
    858.42x = 1,185.75 × 658.04
  4. Step 4: Simplify right side
    858.42x = 780,265.00
  5. Step 5: Solve for x
    x = 780,265.00/858.42
  6. Step 6: Final answer
    x = 908.95

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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.