Home / 21,220.86-29,276.82-13,150.80

Finding the Fourth Proportional to 21,220.86, 29,276.82 and 13,150.80

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Solution

The fourth proportional to 21,220.86, 29,276.82 and 13,150.80 is: 18,143.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.86 : 29,276.82 = 13,150.80 : x
  2. Step 2: Convert to fraction form
    21,220.86/29,276.82 = 13,150.80/x
  3. Step 3: Cross multiply
    21,220.86x = 29,276.82 × 13,150.80
  4. Step 4: Simplify right side
    21,220.86x = 385,013,604.46
  5. Step 5: Solve for x
    x = 385,013,604.46/21,220.86
  6. Step 6: Final answer
    x = 18,143.17

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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.