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Finding the Fourth Proportional to 225,618.55, 311,355.75 and 123,653.43

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Solution

The fourth proportional to 225,618.55, 311,355.75 and 123,653.43 is: 170,642.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,618.55 : 311,355.75 = 123,653.43 : x
  2. Step 2: Convert to fraction form
    225,618.55/311,355.75 = 123,653.43/x
  3. Step 3: Cross multiply
    225,618.55x = 311,355.75 × 123,653.43
  4. Step 4: Simplify right side
    225,618.55x = 38,500,206,437.72
  5. Step 5: Solve for x
    x = 38,500,206,437.72/225,618.55
  6. Step 6: Final answer
    x = 170,642.91

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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.