Home / 138,205.80-190,721.70-77,776.43

Finding the Fourth Proportional to 138,205.80, 190,721.70 and 77,776.43

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Solution

The fourth proportional to 138,205.80, 190,721.70 and 77,776.43 is: 107,330.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,205.80 : 190,721.70 = 77,776.43 : x
  2. Step 2: Convert to fraction form
    138,205.80/190,721.70 = 77,776.43/x
  3. Step 3: Cross multiply
    138,205.80x = 190,721.70 × 77,776.43
  4. Step 4: Simplify right side
    138,205.80x = 14,833,651,995.92
  5. Step 5: Solve for x
    x = 14,833,651,995.92/138,205.80
  6. Step 6: Final answer
    x = 107,330.17

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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.