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Finding the Fourth Proportional to 840.82, 1,260.82 and 313.36

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Solution

The fourth proportional to 840.82, 1,260.82 and 313.36 is: 469.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.82 : 1,260.82 = 313.36 : x
  2. Step 2: Convert to fraction form
    840.82/1,260.82 = 313.36/x
  3. Step 3: Cross multiply
    840.82x = 1,260.82 × 313.36
  4. Step 4: Simplify right side
    840.82x = 395,090.56
  5. Step 5: Solve for x
    x = 395,090.56/840.82
  6. Step 6: Final answer
    x = 469.89

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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.