Home / 21,109.76-29,131.56-11,678.64

Finding the Fourth Proportional to 21,109.76, 29,131.56 and 11,678.64

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Solution

The fourth proportional to 21,109.76, 29,131.56 and 11,678.64 is: 16,116.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.76 : 29,131.56 = 11,678.64 : x
  2. Step 2: Convert to fraction form
    21,109.76/29,131.56 = 11,678.64/x
  3. Step 3: Cross multiply
    21,109.76x = 29,131.56 × 11,678.64
  4. Step 4: Simplify right side
    21,109.76x = 340,217,001.88
  5. Step 5: Solve for x
    x = 340,217,001.88/21,109.76
  6. Step 6: Final answer
    x = 16,116.57

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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.