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Finding the Fourth Proportional to 661.14, 912.31 and 381.32

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Solution

The fourth proportional to 661.14, 912.31 and 381.32 is: 526.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.14 : 912.31 = 381.32 : x
  2. Step 2: Convert to fraction form
    661.14/912.31 = 381.32/x
  3. Step 3: Cross multiply
    661.14x = 912.31 × 381.32
  4. Step 4: Simplify right side
    661.14x = 347,882.05
  5. Step 5: Solve for x
    x = 347,882.05/661.14
  6. Step 6: Final answer
    x = 526.19

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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.