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Finding the Fourth Proportional to 920.44, 1,269.76 and 641.32

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Solution

The fourth proportional to 920.44, 1,269.76 and 641.32 is: 884.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.44 : 1,269.76 = 641.32 : x
  2. Step 2: Convert to fraction form
    920.44/1,269.76 = 641.32/x
  3. Step 3: Cross multiply
    920.44x = 1,269.76 × 641.32
  4. Step 4: Simplify right side
    920.44x = 814,322.48
  5. Step 5: Solve for x
    x = 814,322.48/920.44
  6. Step 6: Final answer
    x = 884.71

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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.