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Finding the Fourth Proportional to 720,884.45, 994,802.91 and 398,586.26

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Solution

The fourth proportional to 720,884.45, 994,802.91 and 398,586.26 is: 550,039.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,884.45 : 994,802.91 = 398,586.26 : x
  2. Step 2: Convert to fraction form
    720,884.45/994,802.91 = 398,586.26/x
  3. Step 3: Cross multiply
    720,884.45x = 994,802.91 × 398,586.26
  4. Step 4: Simplify right side
    720,884.45x = 396,514,771,334.02
  5. Step 5: Solve for x
    x = 396,514,771,334.02/720,884.45
  6. Step 6: Final answer
    x = 550,039.29

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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.