Home / 138,914.26-191,700.21-78,487.72

Finding the Fourth Proportional to 138,914.26, 191,700.21 and 78,487.72

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Solution

The fourth proportional to 138,914.26, 191,700.21 and 78,487.72 is: 108,312.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,914.26 : 191,700.21 = 78,487.72 : x
  2. Step 2: Convert to fraction form
    138,914.26/191,700.21 = 78,487.72/x
  3. Step 3: Cross multiply
    138,914.26x = 191,700.21 × 78,487.72
  4. Step 4: Simplify right side
    138,914.26x = 15,046,112,406.42
  5. Step 5: Solve for x
    x = 15,046,112,406.42/138,914.26
  6. Step 6: Final answer
    x = 108,312.22

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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.