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Finding the Fourth Proportional to 261.47, 392.19 and 107.36

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Solution

The fourth proportional to 261.47, 392.19 and 107.36 is: 161.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.47 : 392.19 = 107.36 : x
  2. Step 2: Convert to fraction form
    261.47/392.19 = 107.36/x
  3. Step 3: Cross multiply
    261.47x = 392.19 × 107.36
  4. Step 4: Simplify right side
    261.47x = 42,103.15
  5. Step 5: Solve for x
    x = 42,103.15/261.47
  6. Step 6: Final answer
    x = 161.03

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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.