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Finding the Fourth Proportional to 212.48, 293.16 and 138.80

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Solution

The fourth proportional to 212.48, 293.16 and 138.80 is: 191.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.48 : 293.16 = 138.80 : x
  2. Step 2: Convert to fraction form
    212.48/293.16 = 138.80/x
  3. Step 3: Cross multiply
    212.48x = 293.16 × 138.80
  4. Step 4: Simplify right side
    212.48x = 40,690.61
  5. Step 5: Solve for x
    x = 40,690.61/212.48
  6. Step 6: Final answer
    x = 191.50

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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.