Home / 20,989.30-28,965.45-11,558.74

Finding the Fourth Proportional to 20,989.30, 28,965.45 and 11,558.74

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Solution

The fourth proportional to 20,989.30, 28,965.45 and 11,558.74 is: 15,951.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.30 : 28,965.45 = 11,558.74 : x
  2. Step 2: Convert to fraction form
    20,989.30/28,965.45 = 11,558.74/x
  3. Step 3: Cross multiply
    20,989.30x = 28,965.45 × 11,558.74
  4. Step 4: Simplify right side
    20,989.30x = 334,804,105.53
  5. Step 5: Solve for x
    x = 334,804,105.53/20,989.30
  6. Step 6: Final answer
    x = 15,951.18

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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.