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Finding the Fourth Proportional to 720,781.94, 994,699.85 and 398,512.85

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Solution

The fourth proportional to 720,781.94, 994,699.85 and 398,512.85 is: 549,959.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,781.94 : 994,699.85 = 398,512.85 : x
  2. Step 2: Convert to fraction form
    720,781.94/994,699.85 = 398,512.85/x
  3. Step 3: Cross multiply
    720,781.94x = 994,699.85 × 398,512.85
  4. Step 4: Simplify right side
    720,781.94x = 396,400,665,152.01
  5. Step 5: Solve for x
    x = 396,400,665,152.01/720,781.94
  6. Step 6: Final answer
    x = 549,959.21

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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.