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Finding the Fourth Proportional to 259,781.12, 389,783.93 and 139,697.71

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Solution

The fourth proportional to 259,781.12, 389,783.93 and 139,697.71 is: 209,606.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,781.12 : 389,783.93 = 139,697.71 : x
  2. Step 2: Convert to fraction form
    259,781.12/389,783.93 = 139,697.71/x
  3. Step 3: Cross multiply
    259,781.12x = 389,783.93 × 139,697.71
  4. Step 4: Simplify right side
    259,781.12x = 54,451,921,717.31
  5. Step 5: Solve for x
    x = 54,451,921,717.31/259,781.12
  6. Step 6: Final answer
    x = 209,606.93

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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.