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Finding the Fourth Proportional to 418.21, 577.14 and 231.69

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Solution

The fourth proportional to 418.21, 577.14 and 231.69 is: 319.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.21 : 577.14 = 231.69 : x
  2. Step 2: Convert to fraction form
    418.21/577.14 = 231.69/x
  3. Step 3: Cross multiply
    418.21x = 577.14 × 231.69
  4. Step 4: Simplify right side
    418.21x = 133,718.86
  5. Step 5: Solve for x
    x = 133,718.86/418.21
  6. Step 6: Final answer
    x = 319.74

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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.