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Finding the Fourth Proportional to 884.98, 1,221.23 and 486.64

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Solution

The fourth proportional to 884.98, 1,221.23 and 486.64 is: 671.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.98 : 1,221.23 = 486.64 : x
  2. Step 2: Convert to fraction form
    884.98/1,221.23 = 486.64/x
  3. Step 3: Cross multiply
    884.98x = 1,221.23 × 486.64
  4. Step 4: Simplify right side
    884.98x = 594,299.37
  5. Step 5: Solve for x
    x = 594,299.37/884.98
  6. Step 6: Final answer
    x = 671.54

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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.