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Finding the Fourth Proportional to 15,930.30, 21,980.44 and 9,561.54

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Solution

The fourth proportional to 15,930.30, 21,980.44 and 9,561.54 is: 13,192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,930.30 : 21,980.44 = 9,561.54 : x
  2. Step 2: Convert to fraction form
    15,930.30/21,980.44 = 9,561.54/x
  3. Step 3: Cross multiply
    15,930.30x = 21,980.44 × 9,561.54
  4. Step 4: Simplify right side
    15,930.30x = 210,166,856.28
  5. Step 5: Solve for x
    x = 210,166,856.28/15,930.30
  6. Step 6: Final answer
    x = 13,192.90

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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.