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Finding the Fourth Proportional to 638.67, 876.21 and 607.69

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Solution

The fourth proportional to 638.67, 876.21 and 607.69 is: 833.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.67 : 876.21 = 607.69 : x
  2. Step 2: Convert to fraction form
    638.67/876.21 = 607.69/x
  3. Step 3: Cross multiply
    638.67x = 876.21 × 607.69
  4. Step 4: Simplify right side
    638.67x = 532,464.05
  5. Step 5: Solve for x
    x = 532,464.05/638.67
  6. Step 6: Final answer
    x = 833.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.