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Finding the Fourth Proportional to 1,380.44, 1,905.02 and 907.80

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Solution

The fourth proportional to 1,380.44, 1,905.02 and 907.80 is: 1,252.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.44 : 1,905.02 = 907.80 : x
  2. Step 2: Convert to fraction form
    1,380.44/1,905.02 = 907.80/x
  3. Step 3: Cross multiply
    1,380.44x = 1,905.02 × 907.80
  4. Step 4: Simplify right side
    1,380.44x = 1,729,377.16
  5. Step 5: Solve for x
    x = 1,729,377.16/1,380.44
  6. Step 6: Final answer
    x = 1,252.77

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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.