Home / 21,142.49-29,157.39-13,575.47

Finding the Fourth Proportional to 21,142.49, 29,157.39 and 13,575.47

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Solution

The fourth proportional to 21,142.49, 29,157.39 and 13,575.47 is: 18,721.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142.49 : 29,157.39 = 13,575.47 : x
  2. Step 2: Convert to fraction form
    21,142.49/29,157.39 = 13,575.47/x
  3. Step 3: Cross multiply
    21,142.49x = 29,157.39 × 13,575.47
  4. Step 4: Simplify right side
    21,142.49x = 395,825,127.44
  5. Step 5: Solve for x
    x = 395,825,127.44/21,142.49
  6. Step 6: Final answer
    x = 18,721.79

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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.