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Finding the Fourth Proportional to 715,722.87, 987,709.83 and 393,446.55

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Solution

The fourth proportional to 715,722.87, 987,709.83 and 393,446.55 is: 542,962.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,722.87 : 987,709.83 = 393,446.55 : x
  2. Step 2: Convert to fraction form
    715,722.87/987,709.83 = 393,446.55/x
  3. Step 3: Cross multiply
    715,722.87x = 987,709.83 × 393,446.55
  4. Step 4: Simplify right side
    715,722.87x = 388,611,025,014.59
  5. Step 5: Solve for x
    x = 388,611,025,014.59/715,722.87
  6. Step 6: Final answer
    x = 542,962.98

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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.