Home / 20,990.08-28,967.52-11,558.80

Finding the Fourth Proportional to 20,990.08, 28,967.52 and 11,558.80

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Solution

The fourth proportional to 20,990.08, 28,967.52 and 11,558.80 is: 15,951.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.08 : 28,967.52 = 11,558.80 : x
  2. Step 2: Convert to fraction form
    20,990.08/28,967.52 = 11,558.80/x
  3. Step 3: Cross multiply
    20,990.08x = 28,967.52 × 11,558.80
  4. Step 4: Simplify right side
    20,990.08x = 334,829,770.18
  5. Step 5: Solve for x
    x = 334,829,770.18/20,990.08
  6. Step 6: Final answer
    x = 15,951.81

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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.