Home / 21,172.55-29,204.70-13,605.86

Finding the Fourth Proportional to 21,172.55, 29,204.70 and 13,605.86

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Solution

The fourth proportional to 21,172.55, 29,204.70 and 13,605.86 is: 18,767.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.55 : 29,204.70 = 13,605.86 : x
  2. Step 2: Convert to fraction form
    21,172.55/29,204.70 = 13,605.86/x
  3. Step 3: Cross multiply
    21,172.55x = 29,204.70 × 13,605.86
  4. Step 4: Simplify right side
    21,172.55x = 397,355,059.54
  5. Step 5: Solve for x
    x = 397,355,059.54/21,172.55
  6. Step 6: Final answer
    x = 18,767.46

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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.