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Finding the Fourth Proportional to 921.33, 1,271.22 and 672.78

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Solution

The fourth proportional to 921.33, 1,271.22 and 672.78 is: 928.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.33 : 1,271.22 = 672.78 : x
  2. Step 2: Convert to fraction form
    921.33/1,271.22 = 672.78/x
  3. Step 3: Cross multiply
    921.33x = 1,271.22 × 672.78
  4. Step 4: Simplify right side
    921.33x = 855,251.39
  5. Step 5: Solve for x
    x = 855,251.39/921.33
  6. Step 6: Final answer
    x = 928.28

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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.