Home / 1,381.20-1,907.28-938.96

Finding the Fourth Proportional to 1,381.20, 1,907.28 and 938.96

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Solution

The fourth proportional to 1,381.20, 1,907.28 and 938.96 is: 1,296.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.20 : 1,907.28 = 938.96 : x
  2. Step 2: Convert to fraction form
    1,381.20/1,907.28 = 938.96/x
  3. Step 3: Cross multiply
    1,381.20x = 1,907.28 × 938.96
  4. Step 4: Simplify right side
    1,381.20x = 1,790,859.63
  5. Step 5: Solve for x
    x = 1,790,859.63/1,381.20
  6. Step 6: Final answer
    x = 1,296.60

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Half scale
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Double scale
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1.5x scale

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.