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Finding the Fourth Proportional to 620.21, 933.90 and 511.55

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Solution

The fourth proportional to 620.21, 933.90 and 511.55 is: 770.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.21 : 933.90 = 511.55 : x
  2. Step 2: Convert to fraction form
    620.21/933.90 = 511.55/x
  3. Step 3: Cross multiply
    620.21x = 933.90 × 511.55
  4. Step 4: Simplify right side
    620.21x = 477,731.88
  5. Step 5: Solve for x
    x = 477,731.88/620.21
  6. Step 6: Final answer
    x = 770.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.