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Finding the Fourth Proportional to 139,772.32, 192,837.84 and 79,338.40

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Solution

The fourth proportional to 139,772.32, 192,837.84 and 79,338.40 is: 109,459.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,772.32 : 192,837.84 = 79,338.40 : x
  2. Step 2: Convert to fraction form
    139,772.32/192,837.84 = 79,338.40/x
  3. Step 3: Cross multiply
    139,772.32x = 192,837.84 × 79,338.40
  4. Step 4: Simplify right side
    139,772.32x = 15,299,445,685.06
  5. Step 5: Solve for x
    x = 15,299,445,685.06/139,772.32
  6. Step 6: Final answer
    x = 109,459.77

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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.