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Finding the Fourth Proportional to 1,305.28, 1,801.32 and 781.36

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Solution

The fourth proportional to 1,305.28, 1,801.32 and 781.36 is: 1,078.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.28 : 1,801.32 = 781.36 : x
  2. Step 2: Convert to fraction form
    1,305.28/1,801.32 = 781.36/x
  3. Step 3: Cross multiply
    1,305.28x = 1,801.32 × 781.36
  4. Step 4: Simplify right side
    1,305.28x = 1,407,479.40
  5. Step 5: Solve for x
    x = 1,407,479.40/1,305.28
  6. Step 6: Final answer
    x = 1,078.30

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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.