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Finding the Fourth Proportional to 400.88, 601.72 and 278.72

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Solution

The fourth proportional to 400.88, 601.72 and 278.72 is: 418.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.88 : 601.72 = 278.72 : x
  2. Step 2: Convert to fraction form
    400.88/601.72 = 278.72/x
  3. Step 3: Cross multiply
    400.88x = 601.72 × 278.72
  4. Step 4: Simplify right side
    400.88x = 167,711.40
  5. Step 5: Solve for x
    x = 167,711.40/400.88
  6. Step 6: Final answer
    x = 418.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.