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Finding the Fourth Proportional to 921.27, 1,271.37 and 722.35

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Solution

The fourth proportional to 921.27, 1,271.37 and 722.35 is: 996.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.27 : 1,271.37 = 722.35 : x
  2. Step 2: Convert to fraction form
    921.27/1,271.37 = 722.35/x
  3. Step 3: Cross multiply
    921.27x = 1,271.37 × 722.35
  4. Step 4: Simplify right side
    921.27x = 918,374.12
  5. Step 5: Solve for x
    x = 918,374.12/921.27
  6. Step 6: Final answer
    x = 996.86

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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.