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Finding the Fourth Proportional to 139,321,111.80, 208,981,667.70 and 74,751,030.30

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Solution

The fourth proportional to 139,321,111.80, 208,981,667.70 and 74,751,030.30 is: 112,126,545.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,321,111.80 : 208,981,667.70 = 74,751,030.30 : x
  2. Step 2: Convert to fraction form
    139,321,111.80/208,981,667.70 = 74,751,030.30/x
  3. Step 3: Cross multiply
    139,321,111.80x = 208,981,667.70 × 74,751,030.30
  4. Step 4: Simplify right side
    139,321,111.80x = 15,621,594,974,387,230
  5. Step 5: Solve for x
    x = 15,621,594,974,387,230/139,321,111.80
  6. Step 6: Final answer
    x = 112,126,545.45

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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.