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Finding the Fourth Proportional to 715,722.37, 987,709.13 and 393,446.05

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Solution

The fourth proportional to 715,722.37, 987,709.13 and 393,446.05 is: 542,962.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,722.37 : 987,709.13 = 393,446.05 : x
  2. Step 2: Convert to fraction form
    715,722.37/987,709.13 = 393,446.05/x
  3. Step 3: Cross multiply
    715,722.37x = 987,709.13 × 393,446.05
  4. Step 4: Simplify right side
    715,722.37x = 388,610,255,747.44
  5. Step 5: Solve for x
    x = 388,610,255,747.44/715,722.37
  6. Step 6: Final answer
    x = 542,962.29

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1.5x scale

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.