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Finding the Fourth Proportional to 931.34, 1,285.80 and 722

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Solution

The fourth proportional to 931.34, 1,285.80 and 722 is: 996.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.34 : 1,285.80 = 722 : x
  2. Step 2: Convert to fraction form
    931.34/1,285.80 = 722/x
  3. Step 3: Cross multiply
    931.34x = 1,285.80 × 722
  4. Step 4: Simplify right side
    931.34x = 928,347.60
  5. Step 5: Solve for x
    x = 928,347.60/931.34
  6. Step 6: Final answer
    x = 996.79

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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.