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Finding the Fourth Proportional to 139,119.94, 191,985.53 and 78,689.28

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Solution

The fourth proportional to 139,119.94, 191,985.53 and 78,689.28 is: 108,591.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,119.94 : 191,985.53 = 78,689.28 : x
  2. Step 2: Convert to fraction form
    139,119.94/191,985.53 = 78,689.28/x
  3. Step 3: Cross multiply
    139,119.94x = 191,985.53 × 78,689.28
  4. Step 4: Simplify right side
    139,119.94x = 15,107,203,322.84
  5. Step 5: Solve for x
    x = 15,107,203,322.84/139,119.94
  6. Step 6: Final answer
    x = 108,591.22

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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.