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Finding the Fourth Proportional to 840.36, 1,260.65 and 378.66

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Solution

The fourth proportional to 840.36, 1,260.65 and 378.66 is: 568.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.36 : 1,260.65 = 378.66 : x
  2. Step 2: Convert to fraction form
    840.36/1,260.65 = 378.66/x
  3. Step 3: Cross multiply
    840.36x = 1,260.65 × 378.66
  4. Step 4: Simplify right side
    840.36x = 477,357.73
  5. Step 5: Solve for x
    x = 477,357.73/840.36
  6. Step 6: Final answer
    x = 568.04

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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.