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Finding the Fourth Proportional to 921.26, 1,270.53 and 672.48

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Solution

The fourth proportional to 921.26, 1,270.53 and 672.48 is: 927.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.26 : 1,270.53 = 672.48 : x
  2. Step 2: Convert to fraction form
    921.26/1,270.53 = 672.48/x
  3. Step 3: Cross multiply
    921.26x = 1,270.53 × 672.48
  4. Step 4: Simplify right side
    921.26x = 854,406.01
  5. Step 5: Solve for x
    x = 854,406.01/921.26
  6. Step 6: Final answer
    x = 927.44

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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.