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Finding the Fourth Proportional to 535.31, 803.04 and 261.21

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Solution

The fourth proportional to 535.31, 803.04 and 261.21 is: 391.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.31 : 803.04 = 261.21 : x
  2. Step 2: Convert to fraction form
    535.31/803.04 = 261.21/x
  3. Step 3: Cross multiply
    535.31x = 803.04 × 261.21
  4. Step 4: Simplify right side
    535.31x = 209,760.77
  5. Step 5: Solve for x
    x = 209,760.77/535.31
  6. Step 6: Final answer
    x = 391.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.