Home / 138,366.72-190,947.20-78,754.56

Finding the Fourth Proportional to 138,366.72, 190,947.20 and 78,754.56

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Solution

The fourth proportional to 138,366.72, 190,947.20 and 78,754.56 is: 108,681.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,366.72 : 190,947.20 = 78,754.56 : x
  2. Step 2: Convert to fraction form
    138,366.72/190,947.20 = 78,754.56/x
  3. Step 3: Cross multiply
    138,366.72x = 190,947.20 × 78,754.56
  4. Step 4: Simplify right side
    138,366.72x = 15,037,962,719.23
  5. Step 5: Solve for x
    x = 15,037,962,719.23/138,366.72
  6. Step 6: Final answer
    x = 108,681.93

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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.