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Finding the Fourth Proportional to 720,348.84, 994,141.26 and 398,121.84

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Solution

The fourth proportional to 720,348.84, 994,141.26 and 398,121.84 is: 549,441.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,348.84 : 994,141.26 = 398,121.84 : x
  2. Step 2: Convert to fraction form
    720,348.84/994,141.26 = 398,121.84/x
  3. Step 3: Cross multiply
    720,348.84x = 994,141.26 × 398,121.84
  4. Step 4: Simplify right side
    720,348.84x = 395,789,347,651.12
  5. Step 5: Solve for x
    x = 395,789,347,651.12/720,348.84
  6. Step 6: Final answer
    x = 549,441.22

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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.