Home / 15,090.90-20,822.22-9,121.38

Finding the Fourth Proportional to 15,090.90, 20,822.22 and 9,121.38

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Solution

The fourth proportional to 15,090.90, 20,822.22 and 9,121.38 is: 12,585.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,090.90 : 20,822.22 = 9,121.38 : x
  2. Step 2: Convert to fraction form
    15,090.90/20,822.22 = 9,121.38/x
  3. Step 3: Cross multiply
    15,090.90x = 20,822.22 × 9,121.38
  4. Step 4: Simplify right side
    15,090.90x = 189,927,381.06
  5. Step 5: Solve for x
    x = 189,927,381.06/15,090.90
  6. Step 6: Final answer
    x = 12,585.56

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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.