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Finding the Fourth Proportional to 202.18, 278.49 and 188.74

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Solution

The fourth proportional to 202.18, 278.49 and 188.74 is: 259.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.18 : 278.49 = 188.74 : x
  2. Step 2: Convert to fraction form
    202.18/278.49 = 188.74/x
  3. Step 3: Cross multiply
    202.18x = 278.49 × 188.74
  4. Step 4: Simplify right side
    202.18x = 52,562.20
  5. Step 5: Solve for x
    x = 52,562.20/202.18
  6. Step 6: Final answer
    x = 259.98

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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.