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Finding the Fourth Proportional to 720,913.80, 994,820.88 and 398,604.60

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Solution

The fourth proportional to 720,913.80, 994,820.88 and 398,604.60 is: 550,052.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,913.80 : 994,820.88 = 398,604.60 : x
  2. Step 2: Convert to fraction form
    720,913.80/994,820.88 = 398,604.60/x
  3. Step 3: Cross multiply
    720,913.80x = 994,820.88 × 398,604.60
  4. Step 4: Simplify right side
    720,913.80x = 396,540,178,944.05
  5. Step 5: Solve for x
    x = 396,540,178,944.05/720,913.80
  6. Step 6: Final answer
    x = 550,052.14

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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.