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Finding the Fourth Proportional to 884.21, 1,220.22 and 485.89

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Solution

The fourth proportional to 884.21, 1,220.22 and 485.89 is: 670.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.21 : 1,220.22 = 485.89 : x
  2. Step 2: Convert to fraction form
    884.21/1,220.22 = 485.89/x
  3. Step 3: Cross multiply
    884.21x = 1,220.22 × 485.89
  4. Step 4: Simplify right side
    884.21x = 592,894.22
  5. Step 5: Solve for x
    x = 592,894.22/884.21
  6. Step 6: Final answer
    x = 670.54

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Double scale
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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.