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Finding the Fourth Proportional to 202.90, 279.98 and 115.58

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Solution

The fourth proportional to 202.90, 279.98 and 115.58 is: 159.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.90 : 279.98 = 115.58 : x
  2. Step 2: Convert to fraction form
    202.90/279.98 = 115.58/x
  3. Step 3: Cross multiply
    202.90x = 279.98 × 115.58
  4. Step 4: Simplify right side
    202.90x = 32,360.09
  5. Step 5: Solve for x
    x = 32,360.09/202.90
  6. Step 6: Final answer
    x = 159.49

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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.