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Finding the Fourth Proportional to 15,591.36, 21,516 and 8,517.60

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Solution

The fourth proportional to 15,591.36, 21,516 and 8,517.60 is: 11,754.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,591.36 : 21,516 = 8,517.60 : x
  2. Step 2: Convert to fraction form
    15,591.36/21,516 = 8,517.60/x
  3. Step 3: Cross multiply
    15,591.36x = 21,516 × 8,517.60
  4. Step 4: Simplify right side
    15,591.36x = 183,264,681.60
  5. Step 5: Solve for x
    x = 183,264,681.60/15,591.36
  6. Step 6: Final answer
    x = 11,754.25

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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.