Home / 20,135.22-27,777.21-15,411.30

Finding the Fourth Proportional to 20,135.22, 27,777.21 and 15,411.30

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Solution

The fourth proportional to 20,135.22, 27,777.21 and 15,411.30 is: 21,260.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,135.22 : 27,777.21 = 15,411.30 : x
  2. Step 2: Convert to fraction form
    20,135.22/27,777.21 = 15,411.30/x
  3. Step 3: Cross multiply
    20,135.22x = 27,777.21 × 15,411.30
  4. Step 4: Simplify right side
    20,135.22x = 428,082,916.47
  5. Step 5: Solve for x
    x = 428,082,916.47/20,135.22
  6. Step 6: Final answer
    x = 21,260.40

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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.