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Finding the Fourth Proportional to 930.58, 1,285.44 and 864.97

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Solution

The fourth proportional to 930.58, 1,285.44 and 864.97 is: 1,194.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.58 : 1,285.44 = 864.97 : x
  2. Step 2: Convert to fraction form
    930.58/1,285.44 = 864.97/x
  3. Step 3: Cross multiply
    930.58x = 1,285.44 × 864.97
  4. Step 4: Simplify right side
    930.58x = 1,111,867.04
  5. Step 5: Solve for x
    x = 1,111,867.04/930.58
  6. Step 6: Final answer
    x = 1,194.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.