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Finding the Fourth Proportional to 921.42, 1,272.66 and 672.36

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Solution

The fourth proportional to 921.42, 1,272.66 and 672.36 is: 928.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.42 : 1,272.66 = 672.36 : x
  2. Step 2: Convert to fraction form
    921.42/1,272.66 = 672.36/x
  3. Step 3: Cross multiply
    921.42x = 1,272.66 × 672.36
  4. Step 4: Simplify right side
    921.42x = 855,685.68
  5. Step 5: Solve for x
    x = 855,685.68/921.42
  6. Step 6: Final answer
    x = 928.66

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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.