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Finding the Fourth Proportional to 986.96, 1,360.63 and 671.73

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Solution

The fourth proportional to 986.96, 1,360.63 and 671.73 is: 926.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.96 : 1,360.63 = 671.73 : x
  2. Step 2: Convert to fraction form
    986.96/1,360.63 = 671.73/x
  3. Step 3: Cross multiply
    986.96x = 1,360.63 × 671.73
  4. Step 4: Simplify right side
    986.96x = 913,975.99
  5. Step 5: Solve for x
    x = 913,975.99/986.96
  6. Step 6: Final answer
    x = 926.05

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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.