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Finding the Fourth Proportional to 912.76, 1,368.84 and 892.72

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Solution

The fourth proportional to 912.76, 1,368.84 and 892.72 is: 1,338.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.76 : 1,368.84 = 892.72 : x
  2. Step 2: Convert to fraction form
    912.76/1,368.84 = 892.72/x
  3. Step 3: Cross multiply
    912.76x = 1,368.84 × 892.72
  4. Step 4: Simplify right side
    912.76x = 1,221,990.84
  5. Step 5: Solve for x
    x = 1,221,990.84/912.76
  6. Step 6: Final answer
    x = 1,338.79

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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.