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Finding the Fourth Proportional to 15,405.54, 21,259.62 and 8,691.15

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Solution

The fourth proportional to 15,405.54, 21,259.62 and 8,691.15 is: 11,993.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.54 : 21,259.62 = 8,691.15 : x
  2. Step 2: Convert to fraction form
    15,405.54/21,259.62 = 8,691.15/x
  3. Step 3: Cross multiply
    15,405.54x = 21,259.62 × 8,691.15
  4. Step 4: Simplify right side
    15,405.54x = 184,770,546.36
  5. Step 5: Solve for x
    x = 184,770,546.36/15,405.54
  6. Step 6: Final answer
    x = 11,993.77

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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.