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Finding the Fourth Proportional to 1,338.67, 2,007.80 and 472.78

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Solution

The fourth proportional to 1,338.67, 2,007.80 and 472.78 is: 709.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.67 : 2,007.80 = 472.78 : x
  2. Step 2: Convert to fraction form
    1,338.67/2,007.80 = 472.78/x
  3. Step 3: Cross multiply
    1,338.67x = 2,007.80 × 472.78
  4. Step 4: Simplify right side
    1,338.67x = 949,247.68
  5. Step 5: Solve for x
    x = 949,247.68/1,338.67
  6. Step 6: Final answer
    x = 709.10

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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.