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Finding the Fourth Proportional to 243.13, 335.50 and 139.63

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Solution

The fourth proportional to 243.13, 335.50 and 139.63 is: 192.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.13 : 335.50 = 139.63 : x
  2. Step 2: Convert to fraction form
    243.13/335.50 = 139.63/x
  3. Step 3: Cross multiply
    243.13x = 335.50 × 139.63
  4. Step 4: Simplify right side
    243.13x = 46,845.87
  5. Step 5: Solve for x
    x = 46,845.87/243.13
  6. Step 6: Final answer
    x = 192.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.