Home / 20,989.91-28,965.93-11,558.47

Finding the Fourth Proportional to 20,989.91, 28,965.93 and 11,558.47

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Solution

The fourth proportional to 20,989.91, 28,965.93 and 11,558.47 is: 15,950.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.91 : 28,965.93 = 11,558.47 : x
  2. Step 2: Convert to fraction form
    20,989.91/28,965.93 = 11,558.47/x
  3. Step 3: Cross multiply
    20,989.91x = 28,965.93 × 11,558.47
  4. Step 4: Simplify right side
    20,989.91x = 334,801,832.93
  5. Step 5: Solve for x
    x = 334,801,832.93/20,989.91
  6. Step 6: Final answer
    x = 15,950.61

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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.