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Finding the Fourth Proportional to 979.88, 1,352.80 and 681.56

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Solution

The fourth proportional to 979.88, 1,352.80 and 681.56 is: 940.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.88 : 1,352.80 = 681.56 : x
  2. Step 2: Convert to fraction form
    979.88/1,352.80 = 681.56/x
  3. Step 3: Cross multiply
    979.88x = 1,352.80 × 681.56
  4. Step 4: Simplify right side
    979.88x = 922,014.37
  5. Step 5: Solve for x
    x = 922,014.37/979.88
  6. Step 6: Final answer
    x = 940.95

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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.