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Finding the Fourth Proportional to 212.52, 292.78 and 202.10

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Solution

The fourth proportional to 212.52, 292.78 and 202.10 is: 278.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.52 : 292.78 = 202.10 : x
  2. Step 2: Convert to fraction form
    212.52/292.78 = 202.10/x
  3. Step 3: Cross multiply
    212.52x = 292.78 × 202.10
  4. Step 4: Simplify right side
    212.52x = 59,170.84
  5. Step 5: Solve for x
    x = 59,170.84/212.52
  6. Step 6: Final answer
    x = 278.42

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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.