Home / 15,086.72-20,820.38-8,372.40

Finding the Fourth Proportional to 15,086.72, 20,820.38 and 8,372.40

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Solution

The fourth proportional to 15,086.72, 20,820.38 and 8,372.40 is: 11,554.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,086.72 : 20,820.38 = 8,372.40 : x
  2. Step 2: Convert to fraction form
    15,086.72/20,820.38 = 8,372.40/x
  3. Step 3: Cross multiply
    15,086.72x = 20,820.38 × 8,372.40
  4. Step 4: Simplify right side
    15,086.72x = 174,316,617.33
  5. Step 5: Solve for x
    x = 174,316,617.33/15,086.72
  6. Step 6: Final answer
    x = 11,554.31

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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.