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Finding the Fourth Proportional to 139,655.32, 192,721.20 and 75,993.28

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Solution

The fourth proportional to 139,655.32, 192,721.20 and 75,993.28 is: 104,869.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,655.32 : 192,721.20 = 75,993.28 : x
  2. Step 2: Convert to fraction form
    139,655.32/192,721.20 = 75,993.28/x
  3. Step 3: Cross multiply
    139,655.32x = 192,721.20 × 75,993.28
  4. Step 4: Simplify right side
    139,655.32x = 14,645,516,113.54
  5. Step 5: Solve for x
    x = 14,645,516,113.54/139,655.32
  6. Step 6: Final answer
    x = 104,869.02

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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.