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Finding the Fourth Proportional to 139,347.50, 192,299.92 and 81,988.98

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Solution

The fourth proportional to 139,347.50, 192,299.92 and 81,988.98 is: 113,145.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,347.50 : 192,299.92 = 81,988.98 : x
  2. Step 2: Convert to fraction form
    139,347.50/192,299.92 = 81,988.98/x
  3. Step 3: Cross multiply
    139,347.50x = 192,299.92 × 81,988.98
  4. Step 4: Simplify right side
    139,347.50x = 15,766,474,294.88
  5. Step 5: Solve for x
    x = 15,766,474,294.88/139,347.50
  6. Step 6: Final answer
    x = 113,145.01

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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.