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Finding the Fourth Proportional to 139,381.86, 192,347.20 and 75,719.72

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Solution

The fourth proportional to 139,381.86, 192,347.20 and 75,719.72 is: 104,493.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,381.86 : 192,347.20 = 75,719.72 : x
  2. Step 2: Convert to fraction form
    139,381.86/192,347.20 = 75,719.72/x
  3. Step 3: Cross multiply
    139,381.86x = 192,347.20 × 75,719.72
  4. Step 4: Simplify right side
    139,381.86x = 14,564,476,126.78
  5. Step 5: Solve for x
    x = 14,564,476,126.78/139,381.86
  6. Step 6: Final answer
    x = 104,493.34

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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.