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Finding the Fourth Proportional to 720,121.39, 993,760.04 and 397,810.44

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Solution

The fourth proportional to 720,121.39, 993,760.04 and 397,810.44 is: 548,974.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,121.39 : 993,760.04 = 397,810.44 : x
  2. Step 2: Convert to fraction form
    720,121.39/993,760.04 = 397,810.44/x
  3. Step 3: Cross multiply
    720,121.39x = 993,760.04 × 397,810.44
  4. Step 4: Simplify right side
    720,121.39x = 395,328,119,761.34
  5. Step 5: Solve for x
    x = 395,328,119,761.34/720,121.39
  6. Step 6: Final answer
    x = 548,974.28

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Double scale
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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.