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Finding the Fourth Proportional to 1,171.45, 1,612.91 and 994.06

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Solution

The fourth proportional to 1,171.45, 1,612.91 and 994.06 is: 1,368.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.45 : 1,612.91 = 994.06 : x
  2. Step 2: Convert to fraction form
    1,171.45/1,612.91 = 994.06/x
  3. Step 3: Cross multiply
    1,171.45x = 1,612.91 × 994.06
  4. Step 4: Simplify right side
    1,171.45x = 1,603,331.55
  5. Step 5: Solve for x
    x = 1,603,331.55/1,171.45
  6. Step 6: Final answer
    x = 1,368.67

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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.