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Finding the Fourth Proportional to 398,617.76, 549,781.44 and 255,391.20

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Solution

The fourth proportional to 398,617.76, 549,781.44 and 255,391.20 is: 352,240.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,617.76 : 549,781.44 = 255,391.20 : x
  2. Step 2: Convert to fraction form
    398,617.76/549,781.44 = 255,391.20/x
  3. Step 3: Cross multiply
    398,617.76x = 549,781.44 × 255,391.20
  4. Step 4: Simplify right side
    398,617.76x = 140,409,341,699.33
  5. Step 5: Solve for x
    x = 140,409,341,699.33/398,617.76
  6. Step 6: Final answer
    x = 352,240.56

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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.