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Finding the Fourth Proportional to 982.71, 1,356.95 and 668.64

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Solution

The fourth proportional to 982.71, 1,356.95 and 668.64 is: 923.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.71 : 1,356.95 = 668.64 : x
  2. Step 2: Convert to fraction form
    982.71/1,356.95 = 668.64/x
  3. Step 3: Cross multiply
    982.71x = 1,356.95 × 668.64
  4. Step 4: Simplify right side
    982.71x = 907,307.70
  5. Step 5: Solve for x
    x = 907,307.70/982.71
  6. Step 6: Final answer
    x = 923.27

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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.