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Finding the Fourth Proportional to 464.76, 641.38 and 257.76

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Solution

The fourth proportional to 464.76, 641.38 and 257.76 is: 355.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.76 : 641.38 = 257.76 : x
  2. Step 2: Convert to fraction form
    464.76/641.38 = 257.76/x
  3. Step 3: Cross multiply
    464.76x = 641.38 × 257.76
  4. Step 4: Simplify right side
    464.76x = 165,322.11
  5. Step 5: Solve for x
    x = 165,322.11/464.76
  6. Step 6: Final answer
    x = 355.72

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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.