Home / 138,995.70-191,812.05-78,564.33

Finding the Fourth Proportional to 138,995.70, 191,812.05 and 78,564.33

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Solution

The fourth proportional to 138,995.70, 191,812.05 and 78,564.33 is: 108,417.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,995.70 : 191,812.05 = 78,564.33 : x
  2. Step 2: Convert to fraction form
    138,995.70/191,812.05 = 78,564.33/x
  3. Step 3: Cross multiply
    138,995.70x = 191,812.05 × 78,564.33
  4. Step 4: Simplify right side
    138,995.70x = 15,069,585,194.18
  5. Step 5: Solve for x
    x = 15,069,585,194.18/138,995.70
  6. Step 6: Final answer
    x = 108,417.64

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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.