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Finding the Fourth Proportional to 418.86, 577.53 and 308.30

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Solution

The fourth proportional to 418.86, 577.53 and 308.30 is: 425.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.86 : 577.53 = 308.30 : x
  2. Step 2: Convert to fraction form
    418.86/577.53 = 308.30/x
  3. Step 3: Cross multiply
    418.86x = 577.53 × 308.30
  4. Step 4: Simplify right side
    418.86x = 178,049.61
  5. Step 5: Solve for x
    x = 178,049.61/418.86
  6. Step 6: Final answer
    x = 425.08

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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.