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Finding the Fourth Proportional to 464.88, 641.12 and 278.40

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Solution

The fourth proportional to 464.88, 641.12 and 278.40 is: 383.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.88 : 641.12 = 278.40 : x
  2. Step 2: Convert to fraction form
    464.88/641.12 = 278.40/x
  3. Step 3: Cross multiply
    464.88x = 641.12 × 278.40
  4. Step 4: Simplify right side
    464.88x = 178,487.81
  5. Step 5: Solve for x
    x = 178,487.81/464.88
  6. Step 6: Final answer
    x = 383.94

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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.