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Finding the Fourth Proportional to 621.99, 933.21 and 189.15

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Solution

The fourth proportional to 621.99, 933.21 and 189.15 is: 283.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 933.21 = 189.15 : x
  2. Step 2: Convert to fraction form
    621.99/933.21 = 189.15/x
  3. Step 3: Cross multiply
    621.99x = 933.21 × 189.15
  4. Step 4: Simplify right side
    621.99x = 176,513.17
  5. Step 5: Solve for x
    x = 176,513.17/621.99
  6. Step 6: Final answer
    x = 283.79

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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.