Home / 138,611.71-191,283.89-78,182.16

Finding the Fourth Proportional to 138,611.71, 191,283.89 and 78,182.16

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Solution

The fourth proportional to 138,611.71, 191,283.89 and 78,182.16 is: 107,891.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,611.71 : 191,283.89 = 78,182.16 : x
  2. Step 2: Convert to fraction form
    138,611.71/191,283.89 = 78,182.16/x
  3. Step 3: Cross multiply
    138,611.71x = 191,283.89 × 78,182.16
  4. Step 4: Simplify right side
    138,611.71x = 14,954,987,693.40
  5. Step 5: Solve for x
    x = 14,954,987,693.40/138,611.71
  6. Step 6: Final answer
    x = 107,891.23

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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.