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Finding the Fourth Proportional to 885.03, 1,221.28 and 492.01

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Solution

The fourth proportional to 885.03, 1,221.28 and 492.01 is: 678.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.03 : 1,221.28 = 492.01 : x
  2. Step 2: Convert to fraction form
    885.03/1,221.28 = 492.01/x
  3. Step 3: Cross multiply
    885.03x = 1,221.28 × 492.01
  4. Step 4: Simplify right side
    885.03x = 600,881.97
  5. Step 5: Solve for x
    x = 600,881.97/885.03
  6. Step 6: Final answer
    x = 678.94

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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.