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Finding the Fourth Proportional to 393,956.70, 590,939.85 and 127,715.10

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Solution

The fourth proportional to 393,956.70, 590,939.85 and 127,715.10 is: 191,574.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,956.70 : 590,939.85 = 127,715.10 : x
  2. Step 2: Convert to fraction form
    393,956.70/590,939.85 = 127,715.10/x
  3. Step 3: Cross multiply
    393,956.70x = 590,939.85 × 127,715.10
  4. Step 4: Simplify right side
    393,956.70x = 75,471,942,036.74
  5. Step 5: Solve for x
    x = 75,471,942,036.74/393,956.70
  6. Step 6: Final answer
    x = 191,574.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.