Home / 21,172.86-31,778.33-11,320.56

Finding the Fourth Proportional to 21,172.86, 31,778.33 and 11,320.56

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Solution

The fourth proportional to 21,172.86, 31,778.33 and 11,320.56 is: 16,991.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.86 : 31,778.33 = 11,320.56 : x
  2. Step 2: Convert to fraction form
    21,172.86/31,778.33 = 11,320.56/x
  3. Step 3: Cross multiply
    21,172.86x = 31,778.33 × 11,320.56
  4. Step 4: Simplify right side
    21,172.86x = 359,748,434.86
  5. Step 5: Solve for x
    x = 359,748,434.86/21,172.86
  6. Step 6: Final answer
    x = 16,991.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.