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Finding the Fourth Proportional to 202.40, 279.30 and 143.32

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Solution

The fourth proportional to 202.40, 279.30 and 143.32 is: 197.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.40 : 279.30 = 143.32 : x
  2. Step 2: Convert to fraction form
    202.40/279.30 = 143.32/x
  3. Step 3: Cross multiply
    202.40x = 279.30 × 143.32
  4. Step 4: Simplify right side
    202.40x = 40,029.28
  5. Step 5: Solve for x
    x = 40,029.28/202.40
  6. Step 6: Final answer
    x = 197.77

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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.