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Finding the Fourth Proportional to 15,330, 21,155.52 and 8,615.64

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Solution

The fourth proportional to 15,330, 21,155.52 and 8,615.64 is: 11,889.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,330 : 21,155.52 = 8,615.64 : x
  2. Step 2: Convert to fraction form
    15,330/21,155.52 = 8,615.64/x
  3. Step 3: Cross multiply
    15,330x = 21,155.52 × 8,615.64
  4. Step 4: Simplify right side
    15,330x = 182,268,344.33
  5. Step 5: Solve for x
    x = 182,268,344.33/15,330
  6. Step 6: Final answer
    x = 11,889.65

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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.