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Finding the Fourth Proportional to 388.50, 579.74 and 336.66

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Solution

The fourth proportional to 388.50, 579.74 and 336.66 is: 502.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.50 : 579.74 = 336.66 : x
  2. Step 2: Convert to fraction form
    388.50/579.74 = 336.66/x
  3. Step 3: Cross multiply
    388.50x = 579.74 × 336.66
  4. Step 4: Simplify right side
    388.50x = 195,173.59
  5. Step 5: Solve for x
    x = 195,173.59/388.50
  6. Step 6: Final answer
    x = 502.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.