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Finding the Fourth Proportional to 984.87, 1,486.71 and 979.40

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Solution

The fourth proportional to 984.87, 1,486.71 and 979.40 is: 1,478.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.87 : 1,486.71 = 979.40 : x
  2. Step 2: Convert to fraction form
    984.87/1,486.71 = 979.40/x
  3. Step 3: Cross multiply
    984.87x = 1,486.71 × 979.40
  4. Step 4: Simplify right side
    984.87x = 1,456,087.49
  5. Step 5: Solve for x
    x = 1,456,087.49/984.87
  6. Step 6: Final answer
    x = 1,478.46

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.