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Finding the Fourth Proportional to 535.76, 803.20 and 261.56

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Solution

The fourth proportional to 535.76, 803.20 and 261.56 is: 392.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.76 : 803.20 = 261.56 : x
  2. Step 2: Convert to fraction form
    535.76/803.20 = 261.56/x
  3. Step 3: Cross multiply
    535.76x = 803.20 × 261.56
  4. Step 4: Simplify right side
    535.76x = 210,084.99
  5. Step 5: Solve for x
    x = 210,084.99/535.76
  6. Step 6: Final answer
    x = 392.13

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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.