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Finding the Fourth Proportional to 225,420.12, 311,009.22 and 129,913.76

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Solution

The fourth proportional to 225,420.12, 311,009.22 and 129,913.76 is: 179,240.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,420.12 : 311,009.22 = 129,913.76 : x
  2. Step 2: Convert to fraction form
    225,420.12/311,009.22 = 129,913.76/x
  3. Step 3: Cross multiply
    225,420.12x = 311,009.22 × 129,913.76
  4. Step 4: Simplify right side
    225,420.12x = 40,404,377,164.87
  5. Step 5: Solve for x
    x = 40,404,377,164.87/225,420.12
  6. Step 6: Final answer
    x = 179,240.33

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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.