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Finding the Fourth Proportional to 983.98, 1,474.62 and 766.54

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Solution

The fourth proportional to 983.98, 1,474.62 and 766.54 is: 1,148.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.98 : 1,474.62 = 766.54 : x
  2. Step 2: Convert to fraction form
    983.98/1,474.62 = 766.54/x
  3. Step 3: Cross multiply
    983.98x = 1,474.62 × 766.54
  4. Step 4: Simplify right side
    983.98x = 1,130,355.21
  5. Step 5: Solve for x
    x = 1,130,355.21/983.98
  6. Step 6: Final answer
    x = 1,148.76

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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.