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Finding the Fourth Proportional to 402.81, 555.15 and 278.47

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Solution

The fourth proportional to 402.81, 555.15 and 278.47 is: 383.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.81 : 555.15 = 278.47 : x
  2. Step 2: Convert to fraction form
    402.81/555.15 = 278.47/x
  3. Step 3: Cross multiply
    402.81x = 555.15 × 278.47
  4. Step 4: Simplify right side
    402.81x = 154,592.62
  5. Step 5: Solve for x
    x = 154,592.62/402.81
  6. Step 6: Final answer
    x = 383.79

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.