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Finding the Fourth Proportional to 21,680.80, 32,521.20 and 6,890.80

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Solution

The fourth proportional to 21,680.80, 32,521.20 and 6,890.80 is: 10,336.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,680.80 : 32,521.20 = 6,890.80 : x
  2. Step 2: Convert to fraction form
    21,680.80/32,521.20 = 6,890.80/x
  3. Step 3: Cross multiply
    21,680.80x = 32,521.20 × 6,890.80
  4. Step 4: Simplify right side
    21,680.80x = 224,097,084.96
  5. Step 5: Solve for x
    x = 224,097,084.96/21,680.80
  6. Step 6: Final answer
    x = 10,336.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.