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Finding the Fourth Proportional to 202.20, 278.91 and 158.64

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Solution

The fourth proportional to 202.20, 278.91 and 158.64 is: 218.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.20 : 278.91 = 158.64 : x
  2. Step 2: Convert to fraction form
    202.20/278.91 = 158.64/x
  3. Step 3: Cross multiply
    202.20x = 278.91 × 158.64
  4. Step 4: Simplify right side
    202.20x = 44,246.28
  5. Step 5: Solve for x
    x = 44,246.28/202.20
  6. Step 6: Final answer
    x = 218.82

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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.