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Finding the Fourth Proportional to 225,517.79, 311,206.42 and 128,726.63

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Solution

The fourth proportional to 225,517.79, 311,206.42 and 128,726.63 is: 177,638.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,517.79 : 311,206.42 = 128,726.63 : x
  2. Step 2: Convert to fraction form
    225,517.79/311,206.42 = 128,726.63/x
  3. Step 3: Cross multiply
    225,517.79x = 311,206.42 × 128,726.63
  4. Step 4: Simplify right side
    225,517.79x = 40,060,554,137.16
  5. Step 5: Solve for x
    x = 40,060,554,137.16/225,517.79
  6. Step 6: Final answer
    x = 177,638.11

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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.