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Finding the Fourth Proportional to 139.18, 208.78 and 62.14

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Solution

The fourth proportional to 139.18, 208.78 and 62.14 is: 93.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.18 : 208.78 = 62.14 : x
  2. Step 2: Convert to fraction form
    139.18/208.78 = 62.14/x
  3. Step 3: Cross multiply
    139.18x = 208.78 × 62.14
  4. Step 4: Simplify right side
    139.18x = 12,973.59
  5. Step 5: Solve for x
    x = 12,973.59/139.18
  6. Step 6: Final answer
    x = 93.21

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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.