Home / 20,389.72-28,143.78-13,317.22

Finding the Fourth Proportional to 20,389.72, 28,143.78 and 13,317.22

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Solution

The fourth proportional to 20,389.72, 28,143.78 and 13,317.22 is: 18,381.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.72 : 28,143.78 = 13,317.22 : x
  2. Step 2: Convert to fraction form
    20,389.72/28,143.78 = 13,317.22/x
  3. Step 3: Cross multiply
    20,389.72x = 28,143.78 × 13,317.22
  4. Step 4: Simplify right side
    20,389.72x = 374,796,909.89
  5. Step 5: Solve for x
    x = 374,796,909.89/20,389.72
  6. Step 6: Final answer
    x = 18,381.66

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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.