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Finding the Fourth Proportional to 885.22, 1,221.55 and 492.23

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Solution

The fourth proportional to 885.22, 1,221.55 and 492.23 is: 679.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.22 : 1,221.55 = 492.23 : x
  2. Step 2: Convert to fraction form
    885.22/1,221.55 = 492.23/x
  3. Step 3: Cross multiply
    885.22x = 1,221.55 × 492.23
  4. Step 4: Simplify right side
    885.22x = 601,283.56
  5. Step 5: Solve for x
    x = 601,283.56/885.22
  6. Step 6: Final answer
    x = 679.25

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1.5x scale

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.