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Finding the Fourth Proportional to 720,847.60, 994,717.32 and 398,561.68

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Solution

The fourth proportional to 720,847.60, 994,717.32 and 398,561.68 is: 549,986.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,847.60 : 994,717.32 = 398,561.68 : x
  2. Step 2: Convert to fraction form
    720,847.60/994,717.32 = 398,561.68/x
  3. Step 3: Cross multiply
    720,847.60x = 994,717.32 × 398,561.68
  4. Step 4: Simplify right side
    720,847.60x = 396,456,206,184.30
  5. Step 5: Solve for x
    x = 396,456,206,184.30/720,847.60
  6. Step 6: Final answer
    x = 549,986.16

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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.