Home / 21,420.68-29,561.13-11,989.24

Finding the Fourth Proportional to 21,420.68, 29,561.13 and 11,989.24

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Solution

The fourth proportional to 21,420.68, 29,561.13 and 11,989.24 is: 16,545.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.68 : 29,561.13 = 11,989.24 : x
  2. Step 2: Convert to fraction form
    21,420.68/29,561.13 = 11,989.24/x
  3. Step 3: Cross multiply
    21,420.68x = 29,561.13 × 11,989.24
  4. Step 4: Simplify right side
    21,420.68x = 354,415,408.34
  5. Step 5: Solve for x
    x = 354,415,408.34/21,420.68
  6. Step 6: Final answer
    x = 16,545.48

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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.