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Finding the Fourth Proportional to 261.36, 392.12 and 139.63

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Solution

The fourth proportional to 261.36, 392.12 and 139.63 is: 209.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.36 : 392.12 = 139.63 : x
  2. Step 2: Convert to fraction form
    261.36/392.12 = 139.63/x
  3. Step 3: Cross multiply
    261.36x = 392.12 × 139.63
  4. Step 4: Simplify right side
    261.36x = 54,751.72
  5. Step 5: Solve for x
    x = 54,751.72/261.36
  6. Step 6: Final answer
    x = 209.49

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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.