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Finding the Fourth Proportional to 139,235.12, 208,580.52 and 68,901.20

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Solution

The fourth proportional to 139,235.12, 208,580.52 and 68,901.20 is: 103,217.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,235.12 : 208,580.52 = 68,901.20 : x
  2. Step 2: Convert to fraction form
    139,235.12/208,580.52 = 68,901.20/x
  3. Step 3: Cross multiply
    139,235.12x = 208,580.52 × 68,901.20
  4. Step 4: Simplify right side
    139,235.12x = 14,371,448,124.62
  5. Step 5: Solve for x
    x = 14,371,448,124.62/139,235.12
  6. Step 6: Final answer
    x = 103,217.12

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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.