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Finding the Fourth Proportional to 1,274.44, 1,910.58 and 840.64

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Solution

The fourth proportional to 1,274.44, 1,910.58 and 840.64 is: 1,260.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.44 : 1,910.58 = 840.64 : x
  2. Step 2: Convert to fraction form
    1,274.44/1,910.58 = 840.64/x
  3. Step 3: Cross multiply
    1,274.44x = 1,910.58 × 840.64
  4. Step 4: Simplify right side
    1,274.44x = 1,606,109.97
  5. Step 5: Solve for x
    x = 1,606,109.97/1,274.44
  6. Step 6: Final answer
    x = 1,260.25

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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.