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Finding the Fourth Proportional to 840.86, 1,261.44 and 263.74

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Solution

The fourth proportional to 840.86, 1,261.44 and 263.74 is: 395.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.86 : 1,261.44 = 263.74 : x
  2. Step 2: Convert to fraction form
    840.86/1,261.44 = 263.74/x
  3. Step 3: Cross multiply
    840.86x = 1,261.44 × 263.74
  4. Step 4: Simplify right side
    840.86x = 332,692.19
  5. Step 5: Solve for x
    x = 332,692.19/840.86
  6. Step 6: Final answer
    x = 395.66

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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.