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Finding the Fourth Proportional to 139,332.20, 208,998.30 and 100,257.80

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Solution

The fourth proportional to 139,332.20, 208,998.30 and 100,257.80 is: 150,386.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,332.20 : 208,998.30 = 100,257.80 : x
  2. Step 2: Convert to fraction form
    139,332.20/208,998.30 = 100,257.80/x
  3. Step 3: Cross multiply
    139,332.20x = 208,998.30 × 100,257.80
  4. Step 4: Simplify right side
    139,332.20x = 20,953,709,761.74
  5. Step 5: Solve for x
    x = 20,953,709,761.74/139,332.20
  6. Step 6: Final answer
    x = 150,386.70

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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.