Home / 21,174.48-29,221.56-12,789.36

Finding the Fourth Proportional to 21,174.48, 29,221.56 and 12,789.36

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Solution

The fourth proportional to 21,174.48, 29,221.56 and 12,789.36 is: 17,649.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,174.48 : 29,221.56 = 12,789.36 : x
  2. Step 2: Convert to fraction form
    21,174.48/29,221.56 = 12,789.36/x
  3. Step 3: Cross multiply
    21,174.48x = 29,221.56 × 12,789.36
  4. Step 4: Simplify right side
    21,174.48x = 373,725,050.60
  5. Step 5: Solve for x
    x = 373,725,050.60/21,174.48
  6. Step 6: Final answer
    x = 17,649.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.