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Finding the Fourth Proportional to 388.88, 581.61 and 345.85

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Solution

The fourth proportional to 388.88, 581.61 and 345.85 is: 517.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.88 : 581.61 = 345.85 : x
  2. Step 2: Convert to fraction form
    388.88/581.61 = 345.85/x
  3. Step 3: Cross multiply
    388.88x = 581.61 × 345.85
  4. Step 4: Simplify right side
    388.88x = 201,150.01
  5. Step 5: Solve for x
    x = 201,150.01/388.88
  6. Step 6: Final answer
    x = 517.25

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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.