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Finding the Fourth Proportional to 720,954.53, 994,897.55 and 398,653.60

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Solution

The fourth proportional to 720,954.53, 994,897.55 and 398,653.60 is: 550,131.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,954.53 : 994,897.55 = 398,653.60 : x
  2. Step 2: Convert to fraction form
    720,954.53/994,897.55 = 398,653.60/x
  3. Step 3: Cross multiply
    720,954.53x = 994,897.55 × 398,653.60
  4. Step 4: Simplify right side
    720,954.53x = 396,619,489,938.68
  5. Step 5: Solve for x
    x = 396,619,489,938.68/720,954.53
  6. Step 6: Final answer
    x = 550,131.07

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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.