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Finding the Fourth Proportional to 720,533.76, 994,388.04 and 398,236.86

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Solution

The fourth proportional to 720,533.76, 994,388.04 and 398,236.86 is: 549,595.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,533.76 : 994,388.04 = 398,236.86 : x
  2. Step 2: Convert to fraction form
    720,533.76/994,388.04 = 398,236.86/x
  3. Step 3: Cross multiply
    720,533.76x = 994,388.04 × 398,236.86
  4. Step 4: Simplify right side
    720,533.76x = 396,001,970,671.15
  5. Step 5: Solve for x
    x = 396,001,970,671.15/720,533.76
  6. Step 6: Final answer
    x = 549,595.30

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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.