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Finding the Fourth Proportional to 339,155.78, 508,805.68 and 128,789.06

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Solution

The fourth proportional to 339,155.78, 508,805.68 and 128,789.06 is: 193,210.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,155.78 : 508,805.68 = 128,789.06 : x
  2. Step 2: Convert to fraction form
    339,155.78/508,805.68 = 128,789.06/x
  3. Step 3: Cross multiply
    339,155.78x = 508,805.68 × 128,789.06
  4. Step 4: Simplify right side
    339,155.78x = 65,528,605,249.86
  5. Step 5: Solve for x
    x = 65,528,605,249.86/339,155.78
  6. Step 6: Final answer
    x = 193,210.93

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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.