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Finding the Fourth Proportional to 885.06, 1,221.45 and 492.12

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Solution

The fourth proportional to 885.06, 1,221.45 and 492.12 is: 679.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.06 : 1,221.45 = 492.12 : x
  2. Step 2: Convert to fraction form
    885.06/1,221.45 = 492.12/x
  3. Step 3: Cross multiply
    885.06x = 1,221.45 × 492.12
  4. Step 4: Simplify right side
    885.06x = 601,099.97
  5. Step 5: Solve for x
    x = 601,099.97/885.06
  6. Step 6: Final answer
    x = 679.16

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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.