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Finding the Fourth Proportional to 993.52, 1,369.74 and 661.15

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Solution

The fourth proportional to 993.52, 1,369.74 and 661.15 is: 911.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.52 : 1,369.74 = 661.15 : x
  2. Step 2: Convert to fraction form
    993.52/1,369.74 = 661.15/x
  3. Step 3: Cross multiply
    993.52x = 1,369.74 × 661.15
  4. Step 4: Simplify right side
    993.52x = 905,603.60
  5. Step 5: Solve for x
    x = 905,603.60/993.52
  6. Step 6: Final answer
    x = 911.51

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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.