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Finding the Fourth Proportional to 139,080.42, 191,928.60 and 78,649.02

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Solution

The fourth proportional to 139,080.42, 191,928.60 and 78,649.02 is: 108,534.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,080.42 : 191,928.60 = 78,649.02 : x
  2. Step 2: Convert to fraction form
    139,080.42/191,928.60 = 78,649.02/x
  3. Step 3: Cross multiply
    139,080.42x = 191,928.60 × 78,649.02
  4. Step 4: Simplify right side
    139,080.42x = 15,094,996,299.97
  5. Step 5: Solve for x
    x = 15,094,996,299.97/139,080.42
  6. Step 6: Final answer
    x = 108,534.30

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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.