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Finding the Fourth Proportional to 28,643.90, 42,879.45 and 25,187.90

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Solution

The fourth proportional to 28,643.90, 42,879.45 and 25,187.90 is: 37,705.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,643.90 : 42,879.45 = 25,187.90 : x
  2. Step 2: Convert to fraction form
    28,643.90/42,879.45 = 25,187.90/x
  3. Step 3: Cross multiply
    28,643.90x = 42,879.45 × 25,187.90
  4. Step 4: Simplify right side
    28,643.90x = 1,080,043,298.66
  5. Step 5: Solve for x
    x = 1,080,043,298.66/28,643.90
  6. Step 6: Final answer
    x = 37,705.87

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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.