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Finding the Fourth Proportional to 138,819.06, 208,018.35 and 91,903.86

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Solution

The fourth proportional to 138,819.06, 208,018.35 and 91,903.86 is: 137,716.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,819.06 : 208,018.35 = 91,903.86 : x
  2. Step 2: Convert to fraction form
    138,819.06/208,018.35 = 91,903.86/x
  3. Step 3: Cross multiply
    138,819.06x = 208,018.35 × 91,903.86
  4. Step 4: Simplify right side
    138,819.06x = 19,117,689,315.83
  5. Step 5: Solve for x
    x = 19,117,689,315.83/138,819.06
  6. Step 6: Final answer
    x = 137,716.60

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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.