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Finding the Fourth Proportional to 996.39, 1,374.37 and 642.76

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Solution

The fourth proportional to 996.39, 1,374.37 and 642.76 is: 886.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.39 : 1,374.37 = 642.76 : x
  2. Step 2: Convert to fraction form
    996.39/1,374.37 = 642.76/x
  3. Step 3: Cross multiply
    996.39x = 1,374.37 × 642.76
  4. Step 4: Simplify right side
    996.39x = 883,390.06
  5. Step 5: Solve for x
    x = 883,390.06/996.39
  6. Step 6: Final answer
    x = 886.59

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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.