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Finding the Fourth Proportional to 715,481.45, 987,316.66 and 393,184.61

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Solution

The fourth proportional to 715,481.45, 987,316.66 and 393,184.61 is: 542,568.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,481.45 : 987,316.66 = 393,184.61 : x
  2. Step 2: Convert to fraction form
    715,481.45/987,316.66 = 393,184.61/x
  3. Step 3: Cross multiply
    715,481.45x = 987,316.66 × 393,184.61
  4. Step 4: Simplify right side
    715,481.45x = 388,197,715,908.60
  5. Step 5: Solve for x
    x = 388,197,715,908.60/715,481.45
  6. Step 6: Final answer
    x = 542,568.53

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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.