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Finding the Fourth Proportional to 720,369.32, 994,105.86 and 398,101.80

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Solution

The fourth proportional to 720,369.32, 994,105.86 and 398,101.80 is: 549,378.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,369.32 : 994,105.86 = 398,101.80 : x
  2. Step 2: Convert to fraction form
    720,369.32/994,105.86 = 398,101.80/x
  3. Step 3: Cross multiply
    720,369.32x = 994,105.86 × 398,101.80
  4. Step 4: Simplify right side
    720,369.32x = 395,755,332,256.55
  5. Step 5: Solve for x
    x = 395,755,332,256.55/720,369.32
  6. Step 6: Final answer
    x = 549,378.38

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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.