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Finding the Fourth Proportional to 720,976.95, 994,965.21 and 398,693.34

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Solution

The fourth proportional to 720,976.95, 994,965.21 and 398,693.34 is: 550,206.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,976.95 : 994,965.21 = 398,693.34 : x
  2. Step 2: Convert to fraction form
    720,976.95/994,965.21 = 398,693.34/x
  3. Step 3: Cross multiply
    720,976.95x = 994,965.21 × 398,693.34
  4. Step 4: Simplify right side
    720,976.95x = 396,686,002,758.70
  5. Step 5: Solve for x
    x = 396,686,002,758.70/720,976.95
  6. Step 6: Final answer
    x = 550,206.22

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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.