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Finding the Fourth Proportional to 138,187.96, 190,700.20 and 77,759.62

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Solution

The fourth proportional to 138,187.96, 190,700.20 and 77,759.62 is: 107,308.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,187.96 : 190,700.20 = 77,759.62 : x
  2. Step 2: Convert to fraction form
    138,187.96/190,700.20 = 77,759.62/x
  3. Step 3: Cross multiply
    138,187.96x = 190,700.20 × 77,759.62
  4. Step 4: Simplify right side
    138,187.96x = 14,828,775,085.92
  5. Step 5: Solve for x
    x = 14,828,775,085.92/138,187.96
  6. Step 6: Final answer
    x = 107,308.73

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1.5x scale

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.