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Finding the Fourth Proportional to 720,967.92, 994,942.22 and 398,699.88

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Solution

The fourth proportional to 720,967.92, 994,942.22 and 398,699.88 is: 550,209.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,967.92 : 994,942.22 = 398,699.88 : x
  2. Step 2: Convert to fraction form
    720,967.92/994,942.22 = 398,699.88/x
  3. Step 3: Cross multiply
    720,967.92x = 994,942.22 × 398,699.88
  4. Step 4: Simplify right side
    720,967.92x = 396,683,343,720.93
  5. Step 5: Solve for x
    x = 396,683,343,720.93/720,967.92
  6. Step 6: Final answer
    x = 550,209.42

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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.