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Finding the Fourth Proportional to 912.73, 1,368.75 and 718.11

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Solution

The fourth proportional to 912.73, 1,368.75 and 718.11 is: 1,076.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.73 : 1,368.75 = 718.11 : x
  2. Step 2: Convert to fraction form
    912.73/1,368.75 = 718.11/x
  3. Step 3: Cross multiply
    912.73x = 1,368.75 × 718.11
  4. Step 4: Simplify right side
    912.73x = 982,906.22
  5. Step 5: Solve for x
    x = 982,906.22/912.73
  6. Step 6: Final answer
    x = 1,076.89

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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.