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Finding the Fourth Proportional to 983.38, 1,356.56 and 668.66

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Solution

The fourth proportional to 983.38, 1,356.56 and 668.66 is: 922.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.38 : 1,356.56 = 668.66 : x
  2. Step 2: Convert to fraction form
    983.38/1,356.56 = 668.66/x
  3. Step 3: Cross multiply
    983.38x = 1,356.56 × 668.66
  4. Step 4: Simplify right side
    983.38x = 907,077.41
  5. Step 5: Solve for x
    x = 907,077.41/983.38
  6. Step 6: Final answer
    x = 922.41

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1.5x scale

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.