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Finding the Fourth Proportional to 464.86, 641.28 and 287.88

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Solution

The fourth proportional to 464.86, 641.28 and 287.88 is: 397.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.86 : 641.28 = 287.88 : x
  2. Step 2: Convert to fraction form
    464.86/641.28 = 287.88/x
  3. Step 3: Cross multiply
    464.86x = 641.28 × 287.88
  4. Step 4: Simplify right side
    464.86x = 184,611.69
  5. Step 5: Solve for x
    x = 184,611.69/464.86
  6. Step 6: Final answer
    x = 397.13

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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.