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Finding the Fourth Proportional to 884.63, 1,220.79 and 491.69

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Solution

The fourth proportional to 884.63, 1,220.79 and 491.69 is: 678.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.63 : 1,220.79 = 491.69 : x
  2. Step 2: Convert to fraction form
    884.63/1,220.79 = 491.69/x
  3. Step 3: Cross multiply
    884.63x = 1,220.79 × 491.69
  4. Step 4: Simplify right side
    884.63x = 600,244.13
  5. Step 5: Solve for x
    x = 600,244.13/884.63
  6. Step 6: Final answer
    x = 678.53

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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.