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Finding the Fourth Proportional to 840.13, 1,260.41 and 493.75

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Solution

The fourth proportional to 840.13, 1,260.41 and 493.75 is: 740.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.13 : 1,260.41 = 493.75 : x
  2. Step 2: Convert to fraction form
    840.13/1,260.41 = 493.75/x
  3. Step 3: Cross multiply
    840.13x = 1,260.41 × 493.75
  4. Step 4: Simplify right side
    840.13x = 622,327.44
  5. Step 5: Solve for x
    x = 622,327.44/840.13
  6. Step 6: Final answer
    x = 740.75

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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.