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Finding the Fourth Proportional to 660,418.65, 990,376.47 and 281,099.97

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Solution

The fourth proportional to 660,418.65, 990,376.47 and 281,099.97 is: 421,542.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,418.65 : 990,376.47 = 281,099.97 : x
  2. Step 2: Convert to fraction form
    660,418.65/990,376.47 = 281,099.97/x
  3. Step 3: Cross multiply
    660,418.65x = 990,376.47 × 281,099.97
  4. Step 4: Simplify right side
    660,418.65x = 278,394,796,005.71
  5. Step 5: Solve for x
    x = 278,394,796,005.71/660,418.65
  6. Step 6: Final answer
    x = 421,542.90

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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.