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Finding the Fourth Proportional to 15,794.13, 21,795.90 and 8,720.55

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Solution

The fourth proportional to 15,794.13, 21,795.90 and 8,720.55 is: 12,034.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,794.13 : 21,795.90 = 8,720.55 : x
  2. Step 2: Convert to fraction form
    15,794.13/21,795.90 = 8,720.55/x
  3. Step 3: Cross multiply
    15,794.13x = 21,795.90 × 8,720.55
  4. Step 4: Simplify right side
    15,794.13x = 190,072,235.75
  5. Step 5: Solve for x
    x = 190,072,235.75/15,794.13
  6. Step 6: Final answer
    x = 12,034.36

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1.5x scale

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.