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Finding the Fourth Proportional to 884.14, 1,324.40 and 420.51

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Solution

The fourth proportional to 884.14, 1,324.40 and 420.51 is: 629.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.14 : 1,324.40 = 420.51 : x
  2. Step 2: Convert to fraction form
    884.14/1,324.40 = 420.51/x
  3. Step 3: Cross multiply
    884.14x = 1,324.40 × 420.51
  4. Step 4: Simplify right side
    884.14x = 556,928.67
  5. Step 5: Solve for x
    x = 556,928.67/884.14
  6. Step 6: Final answer
    x = 629.91

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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.