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Finding the Fourth Proportional to 1,091.70, 1,503.54 and 994.50

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Solution

The fourth proportional to 1,091.70, 1,503.54 and 994.50 is: 1,369.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.70 : 1,503.54 = 994.50 : x
  2. Step 2: Convert to fraction form
    1,091.70/1,503.54 = 994.50/x
  3. Step 3: Cross multiply
    1,091.70x = 1,503.54 × 994.50
  4. Step 4: Simplify right side
    1,091.70x = 1,495,270.53
  5. Step 5: Solve for x
    x = 1,495,270.53/1,091.70
  6. Step 6: Final answer
    x = 1,369.67

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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.