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Finding the Fourth Proportional to 266,168.70, 399,366.45 and 139,905.90

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Solution

The fourth proportional to 266,168.70, 399,366.45 and 139,905.90 is: 209,918.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,168.70 : 399,366.45 = 139,905.90 : x
  2. Step 2: Convert to fraction form
    266,168.70/399,366.45 = 139,905.90/x
  3. Step 3: Cross multiply
    266,168.70x = 399,366.45 × 139,905.90
  4. Step 4: Simplify right side
    266,168.70x = 55,873,722,617.06
  5. Step 5: Solve for x
    x = 55,873,722,617.06/266,168.70
  6. Step 6: Final answer
    x = 209,918.46

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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.