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Finding the Fourth Proportional to 225,679.40, 311,423.20 and 123,686.84

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Solution

The fourth proportional to 225,679.40, 311,423.20 and 123,686.84 is: 170,679.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,679.40 : 311,423.20 = 123,686.84 : x
  2. Step 2: Convert to fraction form
    225,679.40/311,423.20 = 123,686.84/x
  3. Step 3: Cross multiply
    225,679.40x = 311,423.20 × 123,686.84
  4. Step 4: Simplify right side
    225,679.40x = 38,518,951,510.69
  5. Step 5: Solve for x
    x = 38,518,951,510.69/225,679.40
  6. Step 6: Final answer
    x = 170,679.96

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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.