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Finding the Fourth Proportional to 402.18, 554.82 and 278.22

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Solution

The fourth proportional to 402.18, 554.82 and 278.22 is: 383.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.18 : 554.82 = 278.22 : x
  2. Step 2: Convert to fraction form
    402.18/554.82 = 278.22/x
  3. Step 3: Cross multiply
    402.18x = 554.82 × 278.22
  4. Step 4: Simplify right side
    402.18x = 154,362.02
  5. Step 5: Solve for x
    x = 154,362.02/402.18
  6. Step 6: Final answer
    x = 383.81

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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.