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Finding the Fourth Proportional to 620.76, 923.60 and 618.64

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Solution

The fourth proportional to 620.76, 923.60 and 618.64 is: 920.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.76 : 923.60 = 618.64 : x
  2. Step 2: Convert to fraction form
    620.76/923.60 = 618.64/x
  3. Step 3: Cross multiply
    620.76x = 923.60 × 618.64
  4. Step 4: Simplify right side
    620.76x = 571,375.14
  5. Step 5: Solve for x
    x = 571,375.14/620.76
  6. Step 6: Final answer
    x = 920.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.