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Finding the Fourth Proportional to 21,993.76, 30,350.10 and 13,042.12

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Solution

The fourth proportional to 21,993.76, 30,350.10 and 13,042.12 is: 17,997.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,993.76 : 30,350.10 = 13,042.12 : x
  2. Step 2: Convert to fraction form
    21,993.76/30,350.10 = 13,042.12/x
  3. Step 3: Cross multiply
    21,993.76x = 30,350.10 × 13,042.12
  4. Step 4: Simplify right side
    21,993.76x = 395,829,646.21
  5. Step 5: Solve for x
    x = 395,829,646.21/21,993.76
  6. Step 6: Final answer
    x = 17,997.36

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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.