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Finding the Fourth Proportional to 885.44, 1,221.84 and 492.40

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Solution

The fourth proportional to 885.44, 1,221.84 and 492.40 is: 679.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.44 : 1,221.84 = 492.40 : x
  2. Step 2: Convert to fraction form
    885.44/1,221.84 = 492.40/x
  3. Step 3: Cross multiply
    885.44x = 1,221.84 × 492.40
  4. Step 4: Simplify right side
    885.44x = 601,634.02
  5. Step 5: Solve for x
    x = 601,634.02/885.44
  6. Step 6: Final answer
    x = 679.47

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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.