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Finding the Fourth Proportional to 921.76, 1,271.40 and 672.64

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Solution

The fourth proportional to 921.76, 1,271.40 and 672.64 is: 927.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.76 : 1,271.40 = 672.64 : x
  2. Step 2: Convert to fraction form
    921.76/1,271.40 = 672.64/x
  3. Step 3: Cross multiply
    921.76x = 1,271.40 × 672.64
  4. Step 4: Simplify right side
    921.76x = 855,194.50
  5. Step 5: Solve for x
    x = 855,194.50/921.76
  6. Step 6: Final answer
    x = 927.78

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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.