Home / 138,767.30-191,517.63-81,420.51

Finding the Fourth Proportional to 138,767.30, 191,517.63 and 81,420.51

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Solution

The fourth proportional to 138,767.30, 191,517.63 and 81,420.51 is: 112,371.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,767.30 : 191,517.63 = 81,420.51 : x
  2. Step 2: Convert to fraction form
    138,767.30/191,517.63 = 81,420.51/x
  3. Step 3: Cross multiply
    138,767.30x = 191,517.63 × 81,420.51
  4. Step 4: Simplify right side
    138,767.30x = 15,593,463,108.59
  5. Step 5: Solve for x
    x = 15,593,463,108.59/138,767.30
  6. Step 6: Final answer
    x = 112,371.31

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1.5x scale

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.