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Finding the Fourth Proportional to 212.76, 293.56 and 139.07

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Solution

The fourth proportional to 212.76, 293.56 and 139.07 is: 191.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.76 : 293.56 = 139.07 : x
  2. Step 2: Convert to fraction form
    212.76/293.56 = 139.07/x
  3. Step 3: Cross multiply
    212.76x = 293.56 × 139.07
  4. Step 4: Simplify right side
    212.76x = 40,825.39
  5. Step 5: Solve for x
    x = 40,825.39/212.76
  6. Step 6: Final answer
    x = 191.88

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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.