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Finding the Fourth Proportional to 418.86, 577.89 and 261.63

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Solution

The fourth proportional to 418.86, 577.89 and 261.63 is: 360.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.86 : 577.89 = 261.63 : x
  2. Step 2: Convert to fraction form
    418.86/577.89 = 261.63/x
  3. Step 3: Cross multiply
    418.86x = 577.89 × 261.63
  4. Step 4: Simplify right side
    418.86x = 151,193.36
  5. Step 5: Solve for x
    x = 151,193.36/418.86
  6. Step 6: Final answer
    x = 360.96

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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.