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Finding the Fourth Proportional to 21,201.28, 31,803.72 and 5,618.72

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Solution

The fourth proportional to 21,201.28, 31,803.72 and 5,618.72 is: 8,428.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,201.28 : 31,803.72 = 5,618.72 : x
  2. Step 2: Convert to fraction form
    21,201.28/31,803.72 = 5,618.72/x
  3. Step 3: Cross multiply
    21,201.28x = 31,803.72 × 5,618.72
  4. Step 4: Simplify right side
    21,201.28x = 178,696,197.64
  5. Step 5: Solve for x
    x = 178,696,197.64/21,201.28
  6. Step 6: Final answer
    x = 8,428.56

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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.