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Finding the Fourth Proportional to 308,980.72, 426,161.28 and 207,121.06

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Solution

The fourth proportional to 308,980.72, 426,161.28 and 207,121.06 is: 285,671.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,980.72 : 426,161.28 = 207,121.06 : x
  2. Step 2: Convert to fraction form
    308,980.72/426,161.28 = 207,121.06/x
  3. Step 3: Cross multiply
    308,980.72x = 426,161.28 × 207,121.06
  4. Step 4: Simplify right side
    308,980.72x = 88,266,976,044.56
  5. Step 5: Solve for x
    x = 88,266,976,044.56/308,980.72
  6. Step 6: Final answer
    x = 285,671.47

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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.