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Finding the Fourth Proportional to 19,720.80, 29,576.88 and 5,680.80

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Solution

The fourth proportional to 19,720.80, 29,576.88 and 5,680.80 is: 8,519.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.80 : 29,576.88 = 5,680.80 : x
  2. Step 2: Convert to fraction form
    19,720.80/29,576.88 = 5,680.80/x
  3. Step 3: Cross multiply
    19,720.80x = 29,576.88 × 5,680.80
  4. Step 4: Simplify right side
    19,720.80x = 168,020,339.90
  5. Step 5: Solve for x
    x = 168,020,339.90/19,720.80
  6. Step 6: Final answer
    x = 8,519.96

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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.