Home / 20,695.90-31,051.36-12,789.20

Finding the Fourth Proportional to 20,695.90, 31,051.36 and 12,789.20

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Solution

The fourth proportional to 20,695.90, 31,051.36 and 12,789.20 is: 19,188.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,695.90 : 31,051.36 = 12,789.20 : x
  2. Step 2: Convert to fraction form
    20,695.90/31,051.36 = 12,789.20/x
  3. Step 3: Cross multiply
    20,695.90x = 31,051.36 × 12,789.20
  4. Step 4: Simplify right side
    20,695.90x = 397,122,053.31
  5. Step 5: Solve for x
    x = 397,122,053.31/20,695.90
  6. Step 6: Final answer
    x = 19,188.44

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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.