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Finding the Fourth Proportional to 399.78, 552.12 and 275.76

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Solution

The fourth proportional to 399.78, 552.12 and 275.76 is: 380.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.78 : 552.12 = 275.76 : x
  2. Step 2: Convert to fraction form
    399.78/552.12 = 275.76/x
  3. Step 3: Cross multiply
    399.78x = 552.12 × 275.76
  4. Step 4: Simplify right side
    399.78x = 152,252.61
  5. Step 5: Solve for x
    x = 152,252.61/399.78
  6. Step 6: Final answer
    x = 380.84

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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.