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Finding the Fourth Proportional to 884.90, 1,221.17 and 491.93

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Solution

The fourth proportional to 884.90, 1,221.17 and 491.93 is: 678.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.90 : 1,221.17 = 491.93 : x
  2. Step 2: Convert to fraction form
    884.90/1,221.17 = 491.93/x
  3. Step 3: Cross multiply
    884.90x = 1,221.17 × 491.93
  4. Step 4: Simplify right side
    884.90x = 600,730.16
  5. Step 5: Solve for x
    x = 600,730.16/884.90
  6. Step 6: Final answer
    x = 678.87

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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.