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Finding the Fourth Proportional to 535.65, 803.61 and 261.69

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Solution

The fourth proportional to 535.65, 803.61 and 261.69 is: 392.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.65 : 803.61 = 261.69 : x
  2. Step 2: Convert to fraction form
    535.65/803.61 = 261.69/x
  3. Step 3: Cross multiply
    535.65x = 803.61 × 261.69
  4. Step 4: Simplify right side
    535.65x = 210,296.70
  5. Step 5: Solve for x
    x = 210,296.70/535.65
  6. Step 6: Final answer
    x = 392.60

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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.