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Finding the Fourth Proportional to 225,488.16, 311,155.20 and 128,691.54

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Solution

The fourth proportional to 225,488.16, 311,155.20 and 128,691.54 is: 177,583.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,488.16 : 311,155.20 = 128,691.54 : x
  2. Step 2: Convert to fraction form
    225,488.16/311,155.20 = 128,691.54/x
  3. Step 3: Cross multiply
    225,488.16x = 311,155.20 × 128,691.54
  4. Step 4: Simplify right side
    225,488.16x = 40,043,041,867.01
  5. Step 5: Solve for x
    x = 40,043,041,867.01/225,488.16
  6. Step 6: Final answer
    x = 177,583.79

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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.