Home / 138,716.28-191,429.12-78,289.47

Finding the Fourth Proportional to 138,716.28, 191,429.12 and 78,289.47

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Solution

The fourth proportional to 138,716.28, 191,429.12 and 78,289.47 is: 108,039.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,716.28 : 191,429.12 = 78,289.47 : x
  2. Step 2: Convert to fraction form
    138,716.28/191,429.12 = 78,289.47/x
  3. Step 3: Cross multiply
    138,716.28x = 191,429.12 × 78,289.47
  4. Step 4: Simplify right side
    138,716.28x = 14,986,884,543.09
  5. Step 5: Solve for x
    x = 14,986,884,543.09/138,716.28
  6. Step 6: Final answer
    x = 108,039.84

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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.