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Finding the Fourth Proportional to 885.62, 1,221.99 and 492.59

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Solution

The fourth proportional to 885.62, 1,221.99 and 492.59 is: 679.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.62 : 1,221.99 = 492.59 : x
  2. Step 2: Convert to fraction form
    885.62/1,221.99 = 492.59/x
  3. Step 3: Cross multiply
    885.62x = 1,221.99 × 492.59
  4. Step 4: Simplify right side
    885.62x = 601,940.05
  5. Step 5: Solve for x
    x = 601,940.05/885.62
  6. Step 6: Final answer
    x = 679.68

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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.