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Finding the Fourth Proportional to 139.60, 206.68 and 139.60

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Solution

The fourth proportional to 139.60, 206.68 and 139.60 is: 206.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.60 : 206.68 = 139.60 : x
  2. Step 2: Convert to fraction form
    139.60/206.68 = 139.60/x
  3. Step 3: Cross multiply
    139.60x = 206.68 × 139.60
  4. Step 4: Simplify right side
    139.60x = 28,852.53
  5. Step 5: Solve for x
    x = 28,852.53/139.60
  6. Step 6: Final answer
    x = 206.68

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.