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Finding the Fourth Proportional to 139,699.20, 192,821.95 and 86,029.18

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Solution

The fourth proportional to 139,699.20, 192,821.95 and 86,029.18 is: 118,743.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,699.20 : 192,821.95 = 86,029.18 : x
  2. Step 2: Convert to fraction form
    139,699.20/192,821.95 = 86,029.18/x
  3. Step 3: Cross multiply
    139,699.20x = 192,821.95 × 86,029.18
  4. Step 4: Simplify right side
    139,699.20x = 16,588,314,244.50
  5. Step 5: Solve for x
    x = 16,588,314,244.50/139,699.20
  6. Step 6: Final answer
    x = 118,743.09

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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.