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Finding the Fourth Proportional to 845.21, 1,260.59 and 815.82

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Solution

The fourth proportional to 845.21, 1,260.59 and 815.82 is: 1,216.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.21 : 1,260.59 = 815.82 : x
  2. Step 2: Convert to fraction form
    845.21/1,260.59 = 815.82/x
  3. Step 3: Cross multiply
    845.21x = 1,260.59 × 815.82
  4. Step 4: Simplify right side
    845.21x = 1,028,414.53
  5. Step 5: Solve for x
    x = 1,028,414.53/845.21
  6. Step 6: Final answer
    x = 1,216.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.