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Finding the Fourth Proportional to 20,353.68, 28,087.20 and 11,401.20

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Solution

The fourth proportional to 20,353.68, 28,087.20 and 11,401.20 is: 15,733.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,353.68 : 28,087.20 = 11,401.20 : x
  2. Step 2: Convert to fraction form
    20,353.68/28,087.20 = 11,401.20/x
  3. Step 3: Cross multiply
    20,353.68x = 28,087.20 × 11,401.20
  4. Step 4: Simplify right side
    20,353.68x = 320,227,784.64
  5. Step 5: Solve for x
    x = 320,227,784.64/20,353.68
  6. Step 6: Final answer
    x = 15,733.16

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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.