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Finding the Fourth Proportional to 983.18, 1,473.78 and 618.22

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Solution

The fourth proportional to 983.18, 1,473.78 and 618.22 is: 926.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.18 : 1,473.78 = 618.22 : x
  2. Step 2: Convert to fraction form
    983.18/1,473.78 = 618.22/x
  3. Step 3: Cross multiply
    983.18x = 1,473.78 × 618.22
  4. Step 4: Simplify right side
    983.18x = 911,120.27
  5. Step 5: Solve for x
    x = 911,120.27/983.18
  6. Step 6: Final answer
    x = 926.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.