Home / 21,144.80-29,120.64-20,685.62

Finding the Fourth Proportional to 21,144.80, 29,120.64 and 20,685.62

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Solution

The fourth proportional to 21,144.80, 29,120.64 and 20,685.62 is: 28,488.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,144.80 : 29,120.64 = 20,685.62 : x
  2. Step 2: Convert to fraction form
    21,144.80/29,120.64 = 20,685.62/x
  3. Step 3: Cross multiply
    21,144.80x = 29,120.64 × 20,685.62
  4. Step 4: Simplify right side
    21,144.80x = 602,378,493.20
  5. Step 5: Solve for x
    x = 602,378,493.20/21,144.80
  6. Step 6: Final answer
    x = 28,488.26

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Double scale
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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.