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Finding the Fourth Proportional to 266,164.20, 399,359.70 and 139,901.40

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Solution

The fourth proportional to 266,164.20, 399,359.70 and 139,901.40 is: 209,911.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,164.20 : 399,359.70 = 139,901.40 : x
  2. Step 2: Convert to fraction form
    266,164.20/399,359.70 = 139,901.40/x
  3. Step 3: Cross multiply
    266,164.20x = 399,359.70 × 139,901.40
  4. Step 4: Simplify right side
    266,164.20x = 55,870,981,133.58
  5. Step 5: Solve for x
    x = 55,870,981,133.58/266,164.20
  6. Step 6: Final answer
    x = 209,911.71

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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.