Home / 20,817.86-28,729.32-11,386.42

Finding the Fourth Proportional to 20,817.86, 28,729.32 and 11,386.42

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Solution

The fourth proportional to 20,817.86, 28,729.32 and 11,386.42 is: 15,713.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.86 : 28,729.32 = 11,386.42 : x
  2. Step 2: Convert to fraction form
    20,817.86/28,729.32 = 11,386.42/x
  3. Step 3: Cross multiply
    20,817.86x = 28,729.32 × 11,386.42
  4. Step 4: Simplify right side
    20,817.86x = 327,124,032.01
  5. Step 5: Solve for x
    x = 327,124,032.01/20,817.86
  6. Step 6: Final answer
    x = 15,713.63

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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.