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Finding the Fourth Proportional to 15,426.72, 21,288.84 and 8,353.20

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Solution

The fourth proportional to 15,426.72, 21,288.84 and 8,353.20 is: 11,527.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,426.72 : 21,288.84 = 8,353.20 : x
  2. Step 2: Convert to fraction form
    15,426.72/21,288.84 = 8,353.20/x
  3. Step 3: Cross multiply
    15,426.72x = 21,288.84 × 8,353.20
  4. Step 4: Simplify right side
    15,426.72x = 177,829,938.29
  5. Step 5: Solve for x
    x = 177,829,938.29/15,426.72
  6. Step 6: Final answer
    x = 11,527.40

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.