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Finding the Fourth Proportional to 720,754.62, 994,662.13 and 398,485.47

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Solution

The fourth proportional to 720,754.62, 994,662.13 and 398,485.47 is: 549,921.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,754.62 : 994,662.13 = 398,485.47 : x
  2. Step 2: Convert to fraction form
    720,754.62/994,662.13 = 398,485.47/x
  3. Step 3: Cross multiply
    720,754.62x = 994,662.13 × 398,485.47
  4. Step 4: Simplify right side
    720,754.62x = 396,358,409,845.18
  5. Step 5: Solve for x
    x = 396,358,409,845.18/720,754.62
  6. Step 6: Final answer
    x = 549,921.43

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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.