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Finding the Fourth Proportional to 982.21, 1,352.65 and 919.65

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Solution

The fourth proportional to 982.21, 1,352.65 and 919.65 is: 1,266.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.21 : 1,352.65 = 919.65 : x
  2. Step 2: Convert to fraction form
    982.21/1,352.65 = 919.65/x
  3. Step 3: Cross multiply
    982.21x = 1,352.65 × 919.65
  4. Step 4: Simplify right side
    982.21x = 1,243,962.27
  5. Step 5: Solve for x
    x = 1,243,962.27/982.21
  6. Step 6: Final answer
    x = 1,266.50

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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.