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Finding the Fourth Proportional to 993.20, 1,369.32 and 824.72

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Solution

The fourth proportional to 993.20, 1,369.32 and 824.72 is: 1,137.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.20 : 1,369.32 = 824.72 : x
  2. Step 2: Convert to fraction form
    993.20/1,369.32 = 824.72/x
  3. Step 3: Cross multiply
    993.20x = 1,369.32 × 824.72
  4. Step 4: Simplify right side
    993.20x = 1,129,305.59
  5. Step 5: Solve for x
    x = 1,129,305.59/993.20
  6. Step 6: Final answer
    x = 1,137.04

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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.