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Finding the Fourth Proportional to 840.86, 1,261.75 and 293.43

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Solution

The fourth proportional to 840.86, 1,261.75 and 293.43 is: 440.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.86 : 1,261.75 = 293.43 : x
  2. Step 2: Convert to fraction form
    840.86/1,261.75 = 293.43/x
  3. Step 3: Cross multiply
    840.86x = 1,261.75 × 293.43
  4. Step 4: Simplify right side
    840.86x = 370,235.30
  5. Step 5: Solve for x
    x = 370,235.30/840.86
  6. Step 6: Final answer
    x = 440.31

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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.