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Finding the Fourth Proportional to 212.19, 292.68 and 138.53

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Solution

The fourth proportional to 212.19, 292.68 and 138.53 is: 191.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.19 : 292.68 = 138.53 : x
  2. Step 2: Convert to fraction form
    212.19/292.68 = 138.53/x
  3. Step 3: Cross multiply
    212.19x = 292.68 × 138.53
  4. Step 4: Simplify right side
    212.19x = 40,543.50
  5. Step 5: Solve for x
    x = 40,543.50/212.19
  6. Step 6: Final answer
    x = 191.07

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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.