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Finding the Fourth Proportional to 212.91, 293.90 and 135.51

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Solution

The fourth proportional to 212.91, 293.90 and 135.51 is: 187.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.91 : 293.90 = 135.51 : x
  2. Step 2: Convert to fraction form
    212.91/293.90 = 135.51/x
  3. Step 3: Cross multiply
    212.91x = 293.90 × 135.51
  4. Step 4: Simplify right side
    212.91x = 39,826.39
  5. Step 5: Solve for x
    x = 39,826.39/212.91
  6. Step 6: Final answer
    x = 187.06

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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.