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Finding the Fourth Proportional to 621.74, 858.52 and 388.94

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Solution

The fourth proportional to 621.74, 858.52 and 388.94 is: 537.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.74 : 858.52 = 388.94 : x
  2. Step 2: Convert to fraction form
    621.74/858.52 = 388.94/x
  3. Step 3: Cross multiply
    621.74x = 858.52 × 388.94
  4. Step 4: Simplify right side
    621.74x = 333,912.77
  5. Step 5: Solve for x
    x = 333,912.77/621.74
  6. Step 6: Final answer
    x = 537.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.