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Finding the Fourth Proportional to 912.42, 1,368.87 and 263.16

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Solution

The fourth proportional to 912.42, 1,368.87 and 263.16 is: 394.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.42 : 1,368.87 = 263.16 : x
  2. Step 2: Convert to fraction form
    912.42/1,368.87 = 263.16/x
  3. Step 3: Cross multiply
    912.42x = 1,368.87 × 263.16
  4. Step 4: Simplify right side
    912.42x = 360,231.83
  5. Step 5: Solve for x
    x = 360,231.83/912.42
  6. Step 6: Final answer
    x = 394.81

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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.