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Finding the Fourth Proportional to 261.68, 393.24 and 260.26

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Solution

The fourth proportional to 261.68, 393.24 and 260.26 is: 391.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.68 : 393.24 = 260.26 : x
  2. Step 2: Convert to fraction form
    261.68/393.24 = 260.26/x
  3. Step 3: Cross multiply
    261.68x = 393.24 × 260.26
  4. Step 4: Simplify right side
    261.68x = 102,344.64
  5. Step 5: Solve for x
    x = 102,344.64/261.68
  6. Step 6: Final answer
    x = 391.11

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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.