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Finding the Fourth Proportional to 418.86, 577.73 and 278.91

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Solution

The fourth proportional to 418.86, 577.73 and 278.91 is: 384.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.86 : 577.73 = 278.91 : x
  2. Step 2: Convert to fraction form
    418.86/577.73 = 278.91/x
  3. Step 3: Cross multiply
    418.86x = 577.73 × 278.91
  4. Step 4: Simplify right side
    418.86x = 161,135.37
  5. Step 5: Solve for x
    x = 161,135.37/418.86
  6. Step 6: Final answer
    x = 384.70

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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.