Home / 138,406.32-190,990.62-81,806.76

Finding the Fourth Proportional to 138,406.32, 190,990.62 and 81,806.76

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Solution

The fourth proportional to 138,406.32, 190,990.62 and 81,806.76 is: 112,887.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,406.32 : 190,990.62 = 81,806.76 : x
  2. Step 2: Convert to fraction form
    138,406.32/190,990.62 = 81,806.76/x
  3. Step 3: Cross multiply
    138,406.32x = 190,990.62 × 81,806.76
  4. Step 4: Simplify right side
    138,406.32x = 15,624,323,812.59
  5. Step 5: Solve for x
    x = 15,624,323,812.59/138,406.32
  6. Step 6: Final answer
    x = 112,887.36

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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.