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Finding the Fourth Proportional to 1,261.94, 1,893.18 and 611.78

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Solution

The fourth proportional to 1,261.94, 1,893.18 and 611.78 is: 917.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.94 : 1,893.18 = 611.78 : x
  2. Step 2: Convert to fraction form
    1,261.94/1,893.18 = 611.78/x
  3. Step 3: Cross multiply
    1,261.94x = 1,893.18 × 611.78
  4. Step 4: Simplify right side
    1,261.94x = 1,158,209.66
  5. Step 5: Solve for x
    x = 1,158,209.66/1,261.94
  6. Step 6: Final answer
    x = 917.80

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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.