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Finding the Fourth Proportional to 139,243.92, 192,156.81 and 75,581.76

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Solution

The fourth proportional to 139,243.92, 192,156.81 and 75,581.76 is: 104,302.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,243.92 : 192,156.81 = 75,581.76 : x
  2. Step 2: Convert to fraction form
    139,243.92/192,156.81 = 75,581.76/x
  3. Step 3: Cross multiply
    139,243.92x = 192,156.81 × 75,581.76
  4. Step 4: Simplify right side
    139,243.92x = 14,523,549,895.79
  5. Step 5: Solve for x
    x = 14,523,549,895.79/139,243.92
  6. Step 6: Final answer
    x = 104,302.94

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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.