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Finding the Fourth Proportional to 139,690.56, 192,685.92 and 85,217.84

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Solution

The fourth proportional to 139,690.56, 192,685.92 and 85,217.84 is: 117,547.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,690.56 : 192,685.92 = 85,217.84 : x
  2. Step 2: Convert to fraction form
    139,690.56/192,685.92 = 85,217.84/x
  3. Step 3: Cross multiply
    139,690.56x = 192,685.92 × 85,217.84
  4. Step 4: Simplify right side
    139,690.56x = 16,420,277,900.81
  5. Step 5: Solve for x
    x = 16,420,277,900.81/139,690.56
  6. Step 6: Final answer
    x = 117,547.51

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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.