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Finding the Fourth Proportional to 202.40, 278.96 and 136.88

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Solution

The fourth proportional to 202.40, 278.96 and 136.88 is: 188.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.40 : 278.96 = 136.88 : x
  2. Step 2: Convert to fraction form
    202.40/278.96 = 136.88/x
  3. Step 3: Cross multiply
    202.40x = 278.96 × 136.88
  4. Step 4: Simplify right side
    202.40x = 38,184.04
  5. Step 5: Solve for x
    x = 38,184.04/202.40
  6. Step 6: Final answer
    x = 188.66

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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.