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Finding the Fourth Proportional to 15,690.24, 21,651.84 and 8,616.24

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Solution

The fourth proportional to 15,690.24, 21,651.84 and 8,616.24 is: 11,890.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.24 : 21,651.84 = 8,616.24 : x
  2. Step 2: Convert to fraction form
    15,690.24/21,651.84 = 8,616.24/x
  3. Step 3: Cross multiply
    15,690.24x = 21,651.84 × 8,616.24
  4. Step 4: Simplify right side
    15,690.24x = 186,557,449.88
  5. Step 5: Solve for x
    x = 186,557,449.88/15,690.24
  6. Step 6: Final answer
    x = 11,890.03

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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.