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Finding the Fourth Proportional to 15,520.57, 21,417.75 and 8,447.00

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Solution

The fourth proportional to 15,520.57, 21,417.75 and 8,447.00 is: 11,656.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,520.57 : 21,417.75 = 8,447.00 : x
  2. Step 2: Convert to fraction form
    15,520.57/21,417.75 = 8,447.00/x
  3. Step 3: Cross multiply
    15,520.57x = 21,417.75 × 8,447.00
  4. Step 4: Simplify right side
    15,520.57x = 180,915,627.16
  5. Step 5: Solve for x
    x = 180,915,627.16/15,520.57
  6. Step 6: Final answer
    x = 11,656.51

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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.