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Finding the Fourth Proportional to 2,007.78, 3,011.96 and 621.23

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Solution

The fourth proportional to 2,007.78, 3,011.96 and 621.23 is: 931.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,007.78 : 3,011.96 = 621.23 : x
  2. Step 2: Convert to fraction form
    2,007.78/3,011.96 = 621.23/x
  3. Step 3: Cross multiply
    2,007.78x = 3,011.96 × 621.23
  4. Step 4: Simplify right side
    2,007.78x = 1,871,124.33
  5. Step 5: Solve for x
    x = 1,871,124.33/2,007.78
  6. Step 6: Final answer
    x = 931.94

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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.