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Finding the Fourth Proportional to 188.40, 259.72 and 139.12

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Solution

The fourth proportional to 188.40, 259.72 and 139.12 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.40 : 259.72 = 139.12 : x
  2. Step 2: Convert to fraction form
    188.40/259.72 = 139.12/x
  3. Step 3: Cross multiply
    188.40x = 259.72 × 139.12
  4. Step 4: Simplify right side
    188.40x = 36,132.25
  5. Step 5: Solve for x
    x = 36,132.25/188.40
  6. Step 6: Final answer
    x = 191.78

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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.