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Finding the Fourth Proportional to 983.64, 1,355.22 and 633.72

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Solution

The fourth proportional to 983.64, 1,355.22 and 633.72 is: 873.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.64 : 1,355.22 = 633.72 : x
  2. Step 2: Convert to fraction form
    983.64/1,355.22 = 633.72/x
  3. Step 3: Cross multiply
    983.64x = 1,355.22 × 633.72
  4. Step 4: Simplify right side
    983.64x = 858,830.02
  5. Step 5: Solve for x
    x = 858,830.02/983.64
  6. Step 6: Final answer
    x = 873.11

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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.