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Finding the Fourth Proportional to 242.65, 334.81 and 139.13

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Solution

The fourth proportional to 242.65, 334.81 and 139.13 is: 191.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.65 : 334.81 = 139.13 : x
  2. Step 2: Convert to fraction form
    242.65/334.81 = 139.13/x
  3. Step 3: Cross multiply
    242.65x = 334.81 × 139.13
  4. Step 4: Simplify right side
    242.65x = 46,580.79
  5. Step 5: Solve for x
    x = 46,580.79/242.65
  6. Step 6: Final answer
    x = 191.97

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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.