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Finding the Fourth Proportional to 202.88, 279.90 and 137.28

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Solution

The fourth proportional to 202.88, 279.90 and 137.28 is: 189.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.88 : 279.90 = 137.28 : x
  2. Step 2: Convert to fraction form
    202.88/279.90 = 137.28/x
  3. Step 3: Cross multiply
    202.88x = 279.90 × 137.28
  4. Step 4: Simplify right side
    202.88x = 38,424.67
  5. Step 5: Solve for x
    x = 38,424.67/202.88
  6. Step 6: Final answer
    x = 189.40

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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.