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Finding the Fourth Proportional to 15,690.63, 21,663.21 and 9,728.63

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Solution

The fourth proportional to 15,690.63, 21,663.21 and 9,728.63 is: 13,431.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.63 : 21,663.21 = 9,728.63 : x
  2. Step 2: Convert to fraction form
    15,690.63/21,663.21 = 9,728.63/x
  3. Step 3: Cross multiply
    15,690.63x = 21,663.21 × 9,728.63
  4. Step 4: Simplify right side
    15,690.63x = 210,753,246.39
  5. Step 5: Solve for x
    x = 210,753,246.39/15,690.63
  6. Step 6: Final answer
    x = 13,431.79

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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.