Home / 20,720.16-31,094.60-8,238.90

Finding the Fourth Proportional to 20,720.16, 31,094.60 and 8,238.90

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Solution

The fourth proportional to 20,720.16, 31,094.60 and 8,238.90 is: 12,364.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.16 : 31,094.60 = 8,238.90 : x
  2. Step 2: Convert to fraction form
    20,720.16/31,094.60 = 8,238.90/x
  3. Step 3: Cross multiply
    20,720.16x = 31,094.60 × 8,238.90
  4. Step 4: Simplify right side
    20,720.16x = 256,185,212.03
  5. Step 5: Solve for x
    x = 256,185,212.03/20,720.16
  6. Step 6: Final answer
    x = 12,364.05

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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.