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Finding the Fourth Proportional to 855.10, 1,179.67 and 658.30

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Solution

The fourth proportional to 855.10, 1,179.67 and 658.30 is: 908.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.10 : 1,179.67 = 658.30 : x
  2. Step 2: Convert to fraction form
    855.10/1,179.67 = 658.30/x
  3. Step 3: Cross multiply
    855.10x = 1,179.67 × 658.30
  4. Step 4: Simplify right side
    855.10x = 776,576.76
  5. Step 5: Solve for x
    x = 776,576.76/855.10
  6. Step 6: Final answer
    x = 908.17

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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.