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Finding the Fourth Proportional to 135,015.30, 202,498.65 and 85,005.90

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Solution

The fourth proportional to 135,015.30, 202,498.65 and 85,005.90 is: 127,493.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,015.30 : 202,498.65 = 85,005.90 : x
  2. Step 2: Convert to fraction form
    135,015.30/202,498.65 = 85,005.90/x
  3. Step 3: Cross multiply
    135,015.30x = 202,498.65 × 85,005.90
  4. Step 4: Simplify right side
    135,015.30x = 17,213,579,992.04
  5. Step 5: Solve for x
    x = 17,213,579,992.04/135,015.30
  6. Step 6: Final answer
    x = 127,493.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.