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Finding the Fourth Proportional to 639.84, 877.32 and 577.44

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Solution

The fourth proportional to 639.84, 877.32 and 577.44 is: 791.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.84 : 877.32 = 577.44 : x
  2. Step 2: Convert to fraction form
    639.84/877.32 = 577.44/x
  3. Step 3: Cross multiply
    639.84x = 877.32 × 577.44
  4. Step 4: Simplify right side
    639.84x = 506,599.66
  5. Step 5: Solve for x
    x = 506,599.66/639.84
  6. Step 6: Final answer
    x = 791.76

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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.