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Finding the Fourth Proportional to 125,911.78, 188,867.70 and 42,805.78

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Solution

The fourth proportional to 125,911.78, 188,867.70 and 42,805.78 is: 64,208.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,911.78 : 188,867.70 = 42,805.78 : x
  2. Step 2: Convert to fraction form
    125,911.78/188,867.70 = 42,805.78/x
  3. Step 3: Cross multiply
    125,911.78x = 188,867.70 × 42,805.78
  4. Step 4: Simplify right side
    125,911.78x = 8,084,629,215.31
  5. Step 5: Solve for x
    x = 8,084,629,215.31/125,911.78
  6. Step 6: Final answer
    x = 64,208.68

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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.