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Finding the Fourth Proportional to 643.86, 885.87 and 577.17

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Solution

The fourth proportional to 643.86, 885.87 and 577.17 is: 794.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.86 : 885.87 = 577.17 : x
  2. Step 2: Convert to fraction form
    643.86/885.87 = 577.17/x
  3. Step 3: Cross multiply
    643.86x = 885.87 × 577.17
  4. Step 4: Simplify right side
    643.86x = 511,297.59
  5. Step 5: Solve for x
    x = 511,297.59/643.86
  6. Step 6: Final answer
    x = 794.11

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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.