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Finding the Fourth Proportional to 2,007.72, 3,011.21 and 620.88

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Solution

The fourth proportional to 2,007.72, 3,011.21 and 620.88 is: 931.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,007.72 : 3,011.21 = 620.88 : x
  2. Step 2: Convert to fraction form
    2,007.72/3,011.21 = 620.88/x
  3. Step 3: Cross multiply
    2,007.72x = 3,011.21 × 620.88
  4. Step 4: Simplify right side
    2,007.72x = 1,869,596.96
  5. Step 5: Solve for x
    x = 1,869,596.96/2,007.72
  6. Step 6: Final answer
    x = 931.20

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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.