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Finding the Fourth Proportional to 639.82, 877.52 and 613.36

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Solution

The fourth proportional to 639.82, 877.52 and 613.36 is: 841.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.82 : 877.52 = 613.36 : x
  2. Step 2: Convert to fraction form
    639.82/877.52 = 613.36/x
  3. Step 3: Cross multiply
    639.82x = 877.52 × 613.36
  4. Step 4: Simplify right side
    639.82x = 538,235.67
  5. Step 5: Solve for x
    x = 538,235.67/639.82
  6. Step 6: Final answer
    x = 841.23

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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.