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Finding the Fourth Proportional to 261.62, 392.91 and 213.62

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Solution

The fourth proportional to 261.62, 392.91 and 213.62 is: 320.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.62 : 392.91 = 213.62 : x
  2. Step 2: Convert to fraction form
    261.62/392.91 = 213.62/x
  3. Step 3: Cross multiply
    261.62x = 392.91 × 213.62
  4. Step 4: Simplify right side
    261.62x = 83,933.43
  5. Step 5: Solve for x
    x = 83,933.43/261.62
  6. Step 6: Final answer
    x = 320.82

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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.