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Finding the Fourth Proportional to 242.50, 334.65 and 139

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Solution

The fourth proportional to 242.50, 334.65 and 139 is: 191.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.50 : 334.65 = 139 : x
  2. Step 2: Convert to fraction form
    242.50/334.65 = 139/x
  3. Step 3: Cross multiply
    242.50x = 334.65 × 139
  4. Step 4: Simplify right side
    242.50x = 46,516.35
  5. Step 5: Solve for x
    x = 46,516.35/242.50
  6. Step 6: Final answer
    x = 191.82

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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.