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Finding the Fourth Proportional to 265,633.78, 398,568.45 and 139,243.86

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Solution

The fourth proportional to 265,633.78, 398,568.45 and 139,243.86 is: 208,927.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,633.78 : 398,568.45 = 139,243.86 : x
  2. Step 2: Convert to fraction form
    265,633.78/398,568.45 = 139,243.86/x
  3. Step 3: Cross multiply
    265,633.78x = 398,568.45 × 139,243.86
  4. Step 4: Simplify right side
    265,633.78x = 55,498,209,452.22
  5. Step 5: Solve for x
    x = 55,498,209,452.22/265,633.78
  6. Step 6: Final answer
    x = 208,927.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.