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Finding the Fourth Proportional to 139,887.94, 193,039.30 and 79,458.40

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Solution

The fourth proportional to 139,887.94, 193,039.30 and 79,458.40 is: 109,649.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,887.94 : 193,039.30 = 79,458.40 : x
  2. Step 2: Convert to fraction form
    139,887.94/193,039.30 = 79,458.40/x
  3. Step 3: Cross multiply
    139,887.94x = 193,039.30 × 79,458.40
  4. Step 4: Simplify right side
    139,887.94x = 15,338,593,915.12
  5. Step 5: Solve for x
    x = 15,338,593,915.12/139,887.94
  6. Step 6: Final answer
    x = 109,649.15

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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.