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Finding the Fourth Proportional to 621.53, 930.48 and 489.23

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Solution

The fourth proportional to 621.53, 930.48 and 489.23 is: 732.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.53 : 930.48 = 489.23 : x
  2. Step 2: Convert to fraction form
    621.53/930.48 = 489.23/x
  3. Step 3: Cross multiply
    621.53x = 930.48 × 489.23
  4. Step 4: Simplify right side
    621.53x = 455,214.08
  5. Step 5: Solve for x
    x = 455,214.08/621.53
  6. Step 6: Final answer
    x = 732.41

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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.