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Finding the Fourth Proportional to 720,616.62, 994,440.12 and 398,319.60

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Solution

The fourth proportional to 720,616.62, 994,440.12 and 398,319.60 is: 549,675.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,616.62 : 994,440.12 = 398,319.60 : x
  2. Step 2: Convert to fraction form
    720,616.62/994,440.12 = 398,319.60/x
  3. Step 3: Cross multiply
    720,616.62x = 994,440.12 × 398,319.60
  4. Step 4: Simplify right side
    720,616.62x = 396,104,990,822.35
  5. Step 5: Solve for x
    x = 396,104,990,822.35/720,616.62
  6. Step 6: Final answer
    x = 549,675.07

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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.