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Finding the Fourth Proportional to 418.91, 578.15 and 261.70

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Solution

The fourth proportional to 418.91, 578.15 and 261.70 is: 361.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.91 : 578.15 = 261.70 : x
  2. Step 2: Convert to fraction form
    418.91/578.15 = 261.70/x
  3. Step 3: Cross multiply
    418.91x = 578.15 × 261.70
  4. Step 4: Simplify right side
    418.91x = 151,301.86
  5. Step 5: Solve for x
    x = 151,301.86/418.91
  6. Step 6: Final answer
    x = 361.18

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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.