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Finding the Fourth Proportional to 125,985.96, 188,978.76 and 42,879.96

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Solution

The fourth proportional to 125,985.96, 188,978.76 and 42,879.96 is: 64,319.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,985.96 : 188,978.76 = 42,879.96 : x
  2. Step 2: Convert to fraction form
    125,985.96/188,978.76 = 42,879.96/x
  3. Step 3: Cross multiply
    125,985.96x = 188,978.76 × 42,879.96
  4. Step 4: Simplify right side
    125,985.96x = 8,103,401,669.65
  5. Step 5: Solve for x
    x = 8,103,401,669.65/125,985.96
  6. Step 6: Final answer
    x = 64,319.88

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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.