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Finding the Fourth Proportional to 15,662.72, 21,615.65 and 8,589.60

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Solution

The fourth proportional to 15,662.72, 21,615.65 and 8,589.60 is: 11,854.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,662.72 : 21,615.65 = 8,589.60 : x
  2. Step 2: Convert to fraction form
    15,662.72/21,615.65 = 8,589.60/x
  3. Step 3: Cross multiply
    15,662.72x = 21,615.65 × 8,589.60
  4. Step 4: Simplify right side
    15,662.72x = 185,669,744.29
  5. Step 5: Solve for x
    x = 185,669,744.29/15,662.72
  6. Step 6: Final answer
    x = 11,854.25

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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.