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Finding the Fourth Proportional to 1,279.24, 1,918.68 and 907.48

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Solution

The fourth proportional to 1,279.24, 1,918.68 and 907.48 is: 1,361.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.24 : 1,918.68 = 907.48 : x
  2. Step 2: Convert to fraction form
    1,279.24/1,918.68 = 907.48/x
  3. Step 3: Cross multiply
    1,279.24x = 1,918.68 × 907.48
  4. Step 4: Simplify right side
    1,279.24x = 1,741,163.73
  5. Step 5: Solve for x
    x = 1,741,163.73/1,279.24
  6. Step 6: Final answer
    x = 1,361.09

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1.5x scale

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.