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Finding the Fourth Proportional to 884.72, 1,221.26 and 645.80

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Solution

The fourth proportional to 884.72, 1,221.26 and 645.80 is: 891.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.72 : 1,221.26 = 645.80 : x
  2. Step 2: Convert to fraction form
    884.72/1,221.26 = 645.80/x
  3. Step 3: Cross multiply
    884.72x = 1,221.26 × 645.80
  4. Step 4: Simplify right side
    884.72x = 788,689.71
  5. Step 5: Solve for x
    x = 788,689.71/884.72
  6. Step 6: Final answer
    x = 891.46

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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.