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Finding the Fourth Proportional to 720,880.47, 994,774.91 and 398,571.21

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Solution

The fourth proportional to 720,880.47, 994,774.91 and 398,571.21 is: 550,006.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,880.47 : 994,774.91 = 398,571.21 : x
  2. Step 2: Convert to fraction form
    720,880.47/994,774.91 = 398,571.21/x
  3. Step 3: Cross multiply
    720,880.47x = 994,774.91 × 398,571.21
  4. Step 4: Simplify right side
    720,880.47x = 396,488,637,563.49
  5. Step 5: Solve for x
    x = 396,488,637,563.49/720,880.47
  6. Step 6: Final answer
    x = 550,006.07

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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.