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Finding the Fourth Proportional to 139,901.39, 193,063.95 and 76,239.20

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Solution

The fourth proportional to 139,901.39, 193,063.95 and 76,239.20 is: 105,210.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,901.39 : 193,063.95 = 76,239.20 : x
  2. Step 2: Convert to fraction form
    139,901.39/193,063.95 = 76,239.20/x
  3. Step 3: Cross multiply
    139,901.39x = 193,063.95 × 76,239.20
  4. Step 4: Simplify right side
    139,901.39x = 14,719,040,131.52
  5. Step 5: Solve for x
    x = 14,719,040,131.52/139,901.39
  6. Step 6: Final answer
    x = 105,210.11

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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.