Home / 21,109.88-29,132.55-11,678.45

Finding the Fourth Proportional to 21,109.88, 29,132.55 and 11,678.45

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Solution

The fourth proportional to 21,109.88, 29,132.55 and 11,678.45 is: 16,116.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.88 : 29,132.55 = 11,678.45 : x
  2. Step 2: Convert to fraction form
    21,109.88/29,132.55 = 11,678.45/x
  3. Step 3: Cross multiply
    21,109.88x = 29,132.55 × 11,678.45
  4. Step 4: Simplify right side
    21,109.88x = 340,222,882.88
  5. Step 5: Solve for x
    x = 340,222,882.88/21,109.88
  6. Step 6: Final answer
    x = 16,116.76

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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.