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Finding the Fourth Proportional to 15,902.99, 21,950.97 and 9,930.86

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Solution

The fourth proportional to 15,902.99, 21,950.97 and 9,930.86 is: 13,707.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,902.99 : 21,950.97 = 9,930.86 : x
  2. Step 2: Convert to fraction form
    15,902.99/21,950.97 = 9,930.86/x
  3. Step 3: Cross multiply
    15,902.99x = 21,950.97 × 9,930.86
  4. Step 4: Simplify right side
    15,902.99x = 217,992,009.93
  5. Step 5: Solve for x
    x = 217,992,009.93/15,902.99
  6. Step 6: Final answer
    x = 13,707.61

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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.