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Finding the Fourth Proportional to 388.18, 579.22 and 347.32

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Solution

The fourth proportional to 388.18, 579.22 and 347.32 is: 518.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.18 : 579.22 = 347.32 : x
  2. Step 2: Convert to fraction form
    388.18/579.22 = 347.32/x
  3. Step 3: Cross multiply
    388.18x = 579.22 × 347.32
  4. Step 4: Simplify right side
    388.18x = 201,174.69
  5. Step 5: Solve for x
    x = 201,174.69/388.18
  6. Step 6: Final answer
    x = 518.25

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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.