Home / 20,990.50-28,966.89-11,559.04

Finding the Fourth Proportional to 20,990.50, 28,966.89 and 11,559.04

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Solution

The fourth proportional to 20,990.50, 28,966.89 and 11,559.04 is: 15,951.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.50 : 28,966.89 = 11,559.04 : x
  2. Step 2: Convert to fraction form
    20,990.50/28,966.89 = 11,559.04/x
  3. Step 3: Cross multiply
    20,990.50x = 28,966.89 × 11,559.04
  4. Step 4: Simplify right side
    20,990.50x = 334,829,440.19
  5. Step 5: Solve for x
    x = 334,829,440.19/20,990.50
  6. Step 6: Final answer
    x = 15,951.48

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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.