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Finding the Fourth Proportional to 212.79, 318.90 and 91.02

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Solution

The fourth proportional to 212.79, 318.90 and 91.02 is: 136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.79 : 318.90 = 91.02 : x
  2. Step 2: Convert to fraction form
    212.79/318.90 = 91.02/x
  3. Step 3: Cross multiply
    212.79x = 318.90 × 91.02
  4. Step 4: Simplify right side
    212.79x = 29,026.28
  5. Step 5: Solve for x
    x = 29,026.28/212.79
  6. Step 6: Final answer
    x = 136.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.