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Finding the Fourth Proportional to 639.18, 876.89 and 608.19

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Solution

The fourth proportional to 639.18, 876.89 and 608.19 is: 834.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.18 : 876.89 = 608.19 : x
  2. Step 2: Convert to fraction form
    639.18/876.89 = 608.19/x
  3. Step 3: Cross multiply
    639.18x = 876.89 × 608.19
  4. Step 4: Simplify right side
    639.18x = 533,312.69
  5. Step 5: Solve for x
    x = 533,312.69/639.18
  6. Step 6: Final answer
    x = 834.37

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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.