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Finding the Fourth Proportional to 840.48, 1,260.92 and 255.46

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Solution

The fourth proportional to 840.48, 1,260.92 and 255.46 is: 383.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.48 : 1,260.92 = 255.46 : x
  2. Step 2: Convert to fraction form
    840.48/1,260.92 = 255.46/x
  3. Step 3: Cross multiply
    840.48x = 1,260.92 × 255.46
  4. Step 4: Simplify right side
    840.48x = 322,114.62
  5. Step 5: Solve for x
    x = 322,114.62/840.48
  6. Step 6: Final answer
    x = 383.25

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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.