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Finding the Fourth Proportional to 212.58, 293.48 and 138.86

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Solution

The fourth proportional to 212.58, 293.48 and 138.86 is: 191.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.58 : 293.48 = 138.86 : x
  2. Step 2: Convert to fraction form
    212.58/293.48 = 138.86/x
  3. Step 3: Cross multiply
    212.58x = 293.48 × 138.86
  4. Step 4: Simplify right side
    212.58x = 40,752.63
  5. Step 5: Solve for x
    x = 40,752.63/212.58
  6. Step 6: Final answer
    x = 191.70

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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.