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Finding the Fourth Proportional to 983.36, 1,474.80 and 660.68

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Solution

The fourth proportional to 983.36, 1,474.80 and 660.68 is: 990.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.36 : 1,474.80 = 660.68 : x
  2. Step 2: Convert to fraction form
    983.36/1,474.80 = 660.68/x
  3. Step 3: Cross multiply
    983.36x = 1,474.80 × 660.68
  4. Step 4: Simplify right side
    983.36x = 974,370.86
  5. Step 5: Solve for x
    x = 974,370.86/983.36
  6. Step 6: Final answer
    x = 990.86

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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.