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Finding the Fourth Proportional to 266,685.63, 399,997.61 and 66,990.81

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Solution

The fourth proportional to 266,685.63, 399,997.61 and 66,990.81 is: 100,478.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,685.63 : 399,997.61 = 66,990.81 : x
  2. Step 2: Convert to fraction form
    266,685.63/399,997.61 = 66,990.81/x
  3. Step 3: Cross multiply
    266,685.63x = 399,997.61 × 66,990.81
  4. Step 4: Simplify right side
    266,685.63x = 26,796,165,308.22
  5. Step 5: Solve for x
    x = 26,796,165,308.22/266,685.63
  6. Step 6: Final answer
    x = 100,478.48

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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.