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Finding the Fourth Proportional to 748.97, 1,123.45 and 620.45

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Solution

The fourth proportional to 748.97, 1,123.45 and 620.45 is: 930.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.97 : 1,123.45 = 620.45 : x
  2. Step 2: Convert to fraction form
    748.97/1,123.45 = 620.45/x
  3. Step 3: Cross multiply
    748.97x = 1,123.45 × 620.45
  4. Step 4: Simplify right side
    748.97x = 697,044.55
  5. Step 5: Solve for x
    x = 697,044.55/748.97
  6. Step 6: Final answer
    x = 930.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.