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Finding the Fourth Proportional to 620.61, 930.70 and 230.55

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Solution

The fourth proportional to 620.61, 930.70 and 230.55 is: 345.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.61 : 930.70 = 230.55 : x
  2. Step 2: Convert to fraction form
    620.61/930.70 = 230.55/x
  3. Step 3: Cross multiply
    620.61x = 930.70 × 230.55
  4. Step 4: Simplify right side
    620.61x = 214,572.89
  5. Step 5: Solve for x
    x = 214,572.89/620.61
  6. Step 6: Final answer
    x = 345.75

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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.