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Finding the Fourth Proportional to 1,379.67, 1,902.98 and 907.41

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Solution

The fourth proportional to 1,379.67, 1,902.98 and 907.41 is: 1,251.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.67 : 1,902.98 = 907.41 : x
  2. Step 2: Convert to fraction form
    1,379.67/1,902.98 = 907.41/x
  3. Step 3: Cross multiply
    1,379.67x = 1,902.98 × 907.41
  4. Step 4: Simplify right side
    1,379.67x = 1,726,785.68
  5. Step 5: Solve for x
    x = 1,726,785.68/1,379.67
  6. Step 6: Final answer
    x = 1,251.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.