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Finding the Fourth Proportional to 912.64, 1,368.96 and 263.38

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Solution

The fourth proportional to 912.64, 1,368.96 and 263.38 is: 395.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.64 : 1,368.96 = 263.38 : x
  2. Step 2: Convert to fraction form
    912.64/1,368.96 = 263.38/x
  3. Step 3: Cross multiply
    912.64x = 1,368.96 × 263.38
  4. Step 4: Simplify right side
    912.64x = 360,556.68
  5. Step 5: Solve for x
    x = 360,556.68/912.64
  6. Step 6: Final answer
    x = 395.07

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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.