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Finding the Fourth Proportional to 15,690, 21,652.20 and 8,616.54

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Solution

The fourth proportional to 15,690, 21,652.20 and 8,616.54 is: 11,890.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690 : 21,652.20 = 8,616.54 : x
  2. Step 2: Convert to fraction form
    15,690/21,652.20 = 8,616.54/x
  3. Step 3: Cross multiply
    15,690x = 21,652.20 × 8,616.54
  4. Step 4: Simplify right side
    15,690x = 186,567,047.39
  5. Step 5: Solve for x
    x = 186,567,047.39/15,690
  6. Step 6: Final answer
    x = 11,890.83

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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.