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Finding the Fourth Proportional to 139.46, 207.48 and 138.98

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Solution

The fourth proportional to 139.46, 207.48 and 138.98 is: 206.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.46 : 207.48 = 138.98 : x
  2. Step 2: Convert to fraction form
    139.46/207.48 = 138.98/x
  3. Step 3: Cross multiply
    139.46x = 207.48 × 138.98
  4. Step 4: Simplify right side
    139.46x = 28,834.53
  5. Step 5: Solve for x
    x = 28,834.53/139.46
  6. Step 6: Final answer
    x = 206.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.