Home / 21,581.28-29,781.54-12,021.12

Finding the Fourth Proportional to 21,581.28, 29,781.54 and 12,021.12

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Solution

The fourth proportional to 21,581.28, 29,781.54 and 12,021.12 is: 16,588.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,581.28 : 29,781.54 = 12,021.12 : x
  2. Step 2: Convert to fraction form
    21,581.28/29,781.54 = 12,021.12/x
  3. Step 3: Cross multiply
    21,581.28x = 29,781.54 × 12,021.12
  4. Step 4: Simplify right side
    21,581.28x = 358,007,466.12
  5. Step 5: Solve for x
    x = 358,007,466.12/21,581.28
  6. Step 6: Final answer
    x = 16,588.80

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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.