Home / 138,749.53-208,115.66-85,451.65

Finding the Fourth Proportional to 138,749.53, 208,115.66 and 85,451.65

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Solution

The fourth proportional to 138,749.53, 208,115.66 and 85,451.65 is: 128,172.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,749.53 : 208,115.66 = 85,451.65 : x
  2. Step 2: Convert to fraction form
    138,749.53/208,115.66 = 85,451.65/x
  3. Step 3: Cross multiply
    138,749.53x = 208,115.66 × 85,451.65
  4. Step 4: Simplify right side
    138,749.53x = 17,783,826,110.58
  5. Step 5: Solve for x
    x = 17,783,826,110.58/138,749.53
  6. Step 6: Final answer
    x = 128,172.15

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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.