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Finding the Fourth Proportional to 15,930.72, 21,981.24 and 9,643.68

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Solution

The fourth proportional to 15,930.72, 21,981.24 and 9,643.68 is: 13,306.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,930.72 : 21,981.24 = 9,643.68 : x
  2. Step 2: Convert to fraction form
    15,930.72/21,981.24 = 9,643.68/x
  3. Step 3: Cross multiply
    15,930.72x = 21,981.24 × 9,643.68
  4. Step 4: Simplify right side
    15,930.72x = 211,980,044.56
  5. Step 5: Solve for x
    x = 211,980,044.56/15,930.72
  6. Step 6: Final answer
    x = 13,306.37

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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.