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Finding the Fourth Proportional to 845.40, 1,266.38 and 815.48

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Solution

The fourth proportional to 845.40, 1,266.38 and 815.48 is: 1,221.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.40 : 1,266.38 = 815.48 : x
  2. Step 2: Convert to fraction form
    845.40/1,266.38 = 815.48/x
  3. Step 3: Cross multiply
    845.40x = 1,266.38 × 815.48
  4. Step 4: Simplify right side
    845.40x = 1,032,707.56
  5. Step 5: Solve for x
    x = 1,032,707.56/845.40
  6. Step 6: Final answer
    x = 1,221.56

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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.