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Finding the Fourth Proportional to 202.80, 279.84 and 137.40

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Solution

The fourth proportional to 202.80, 279.84 and 137.40 is: 189.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.80 : 279.84 = 137.40 : x
  2. Step 2: Convert to fraction form
    202.80/279.84 = 137.40/x
  3. Step 3: Cross multiply
    202.80x = 279.84 × 137.40
  4. Step 4: Simplify right side
    202.80x = 38,450.02
  5. Step 5: Solve for x
    x = 38,450.02/202.80
  6. Step 6: Final answer
    x = 189.60

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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.