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Finding the Fourth Proportional to 15,593.76, 21,520 and 8,520.48

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Solution

The fourth proportional to 15,593.76, 21,520 and 8,520.48 is: 11,758.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,593.76 : 21,520 = 8,520.48 : x
  2. Step 2: Convert to fraction form
    15,593.76/21,520 = 8,520.48/x
  3. Step 3: Cross multiply
    15,593.76x = 21,520 × 8,520.48
  4. Step 4: Simplify right side
    15,593.76x = 183,360,729.60
  5. Step 5: Solve for x
    x = 183,360,729.60/15,593.76
  6. Step 6: Final answer
    x = 11,758.60

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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.