Home / 21,143.48-29,178.05-12,191.58

Finding the Fourth Proportional to 21,143.48, 29,178.05 and 12,191.58

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Solution

The fourth proportional to 21,143.48, 29,178.05 and 12,191.58 is: 16,824.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.48 : 29,178.05 = 12,191.58 : x
  2. Step 2: Convert to fraction form
    21,143.48/29,178.05 = 12,191.58/x
  3. Step 3: Cross multiply
    21,143.48x = 29,178.05 × 12,191.58
  4. Step 4: Simplify right side
    21,143.48x = 355,726,469.86
  5. Step 5: Solve for x
    x = 355,726,469.86/21,143.48
  6. Step 6: Final answer
    x = 16,824.41

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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.