Home / 138,781.08-191,520.45-81,461.43

Finding the Fourth Proportional to 138,781.08, 191,520.45 and 81,461.43

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Solution

The fourth proportional to 138,781.08, 191,520.45 and 81,461.43 is: 112,418.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,781.08 : 191,520.45 = 81,461.43 : x
  2. Step 2: Convert to fraction form
    138,781.08/191,520.45 = 81,461.43/x
  3. Step 3: Cross multiply
    138,781.08x = 191,520.45 × 81,461.43
  4. Step 4: Simplify right side
    138,781.08x = 15,601,529,731.24
  5. Step 5: Solve for x
    x = 15,601,529,731.24/138,781.08
  6. Step 6: Final answer
    x = 112,418.28

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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.