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Finding the Fourth Proportional to 720,909.80, 994,815.40 and 398,600.56

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Solution

The fourth proportional to 720,909.80, 994,815.40 and 398,600.56 is: 550,046.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,909.80 : 994,815.40 = 398,600.56 : x
  2. Step 2: Convert to fraction form
    720,909.80/994,815.40 = 398,600.56/x
  3. Step 3: Cross multiply
    720,909.80x = 994,815.40 × 398,600.56
  4. Step 4: Simplify right side
    720,909.80x = 396,533,975,536.62
  5. Step 5: Solve for x
    x = 396,533,975,536.62/720,909.80
  6. Step 6: Final answer
    x = 550,046.59

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1.5x scale

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.