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Finding the Fourth Proportional to 38,687.77, 58,053.12 and 20,917.99

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Solution

The fourth proportional to 38,687.77, 58,053.12 and 20,917.99 is: 31,388.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,687.77 : 58,053.12 = 20,917.99 : x
  2. Step 2: Convert to fraction form
    38,687.77/58,053.12 = 20,917.99/x
  3. Step 3: Cross multiply
    38,687.77x = 58,053.12 × 20,917.99
  4. Step 4: Simplify right side
    38,687.77x = 1,214,354,583.63
  5. Step 5: Solve for x
    x = 1,214,354,583.63/38,687.77
  6. Step 6: Final answer
    x = 31,388.59

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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.