Home / 20,918.25-31,380.30-6,128.28

Finding the Fourth Proportional to 20,918.25, 31,380.30 and 6,128.28

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Solution

The fourth proportional to 20,918.25, 31,380.30 and 6,128.28 is: 9,193.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.25 : 31,380.30 = 6,128.28 : x
  2. Step 2: Convert to fraction form
    20,918.25/31,380.30 = 6,128.28/x
  3. Step 3: Cross multiply
    20,918.25x = 31,380.30 × 6,128.28
  4. Step 4: Simplify right side
    20,918.25x = 192,307,264.88
  5. Step 5: Solve for x
    x = 192,307,264.88/20,918.25
  6. Step 6: Final answer
    x = 9,193.28

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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.