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Finding the Fourth Proportional to 884.67, 1,220.87 and 491.72

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Solution

The fourth proportional to 884.67, 1,220.87 and 491.72 is: 678.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.67 : 1,220.87 = 491.72 : x
  2. Step 2: Convert to fraction form
    884.67/1,220.87 = 491.72/x
  3. Step 3: Cross multiply
    884.67x = 1,220.87 × 491.72
  4. Step 4: Simplify right side
    884.67x = 600,328.19
  5. Step 5: Solve for x
    x = 600,328.19/884.67
  6. Step 6: Final answer
    x = 678.59

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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.