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Finding the Fourth Proportional to 402.74, 555.21 and 278.19

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Solution

The fourth proportional to 402.74, 555.21 and 278.19 is: 383.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.74 : 555.21 = 278.19 : x
  2. Step 2: Convert to fraction form
    402.74/555.21 = 278.19/x
  3. Step 3: Cross multiply
    402.74x = 555.21 × 278.19
  4. Step 4: Simplify right side
    402.74x = 154,453.87
  5. Step 5: Solve for x
    x = 154,453.87/402.74
  6. Step 6: Final answer
    x = 383.51

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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.