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Finding the Fourth Proportional to 402.78, 555.42 and 263.02

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Solution

The fourth proportional to 402.78, 555.42 and 263.02 is: 362.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.78 : 555.42 = 263.02 : x
  2. Step 2: Convert to fraction form
    402.78/555.42 = 263.02/x
  3. Step 3: Cross multiply
    402.78x = 555.42 × 263.02
  4. Step 4: Simplify right side
    402.78x = 146,086.57
  5. Step 5: Solve for x
    x = 146,086.57/402.78
  6. Step 6: Final answer
    x = 362.70

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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.