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Finding the Fourth Proportional to 845.90, 1,268.85 and 260.90

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Solution

The fourth proportional to 845.90, 1,268.85 and 260.90 is: 391.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.90 : 1,268.85 = 260.90 : x
  2. Step 2: Convert to fraction form
    845.90/1,268.85 = 260.90/x
  3. Step 3: Cross multiply
    845.90x = 1,268.85 × 260.90
  4. Step 4: Simplify right side
    845.90x = 331,042.97
  5. Step 5: Solve for x
    x = 331,042.97/845.90
  6. Step 6: Final answer
    x = 391.35

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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.