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Finding the Fourth Proportional to 2,008.65, 3,011.90 and 621.39

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Solution

The fourth proportional to 2,008.65, 3,011.90 and 621.39 is: 931.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,008.65 : 3,011.90 = 621.39 : x
  2. Step 2: Convert to fraction form
    2,008.65/3,011.90 = 621.39/x
  3. Step 3: Cross multiply
    2,008.65x = 3,011.90 × 621.39
  4. Step 4: Simplify right side
    2,008.65x = 1,871,561.43
  5. Step 5: Solve for x
    x = 1,871,561.43/2,008.65
  6. Step 6: Final answer
    x = 931.75

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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.