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Finding the Fourth Proportional to 402.23, 555.47 and 278.21

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Solution

The fourth proportional to 402.23, 555.47 and 278.21 is: 384.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.23 : 555.47 = 278.21 : x
  2. Step 2: Convert to fraction form
    402.23/555.47 = 278.21/x
  3. Step 3: Cross multiply
    402.23x = 555.47 × 278.21
  4. Step 4: Simplify right side
    402.23x = 154,537.31
  5. Step 5: Solve for x
    x = 154,537.31/402.23
  6. Step 6: Final answer
    x = 384.20

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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.