Home / 149,138.12-205,814.40-81,158.78

Finding the Fourth Proportional to 149,138.12, 205,814.40 and 81,158.78

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Solution

The fourth proportional to 149,138.12, 205,814.40 and 81,158.78 is: 112,001.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,138.12 : 205,814.40 = 81,158.78 : x
  2. Step 2: Convert to fraction form
    149,138.12/205,814.40 = 81,158.78/x
  3. Step 3: Cross multiply
    149,138.12x = 205,814.40 × 81,158.78
  4. Step 4: Simplify right side
    149,138.12x = 16,703,645,610.43
  5. Step 5: Solve for x
    x = 16,703,645,610.43/149,138.12
  6. Step 6: Final answer
    x = 112,001.18

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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.