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Finding the Fourth Proportional to 388.97, 581.72 and 345.93

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Solution

The fourth proportional to 388.97, 581.72 and 345.93 is: 517.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.97 : 581.72 = 345.93 : x
  2. Step 2: Convert to fraction form
    388.97/581.72 = 345.93/x
  3. Step 3: Cross multiply
    388.97x = 581.72 × 345.93
  4. Step 4: Simplify right side
    388.97x = 201,234.40
  5. Step 5: Solve for x
    x = 201,234.40/388.97
  6. Step 6: Final answer
    x = 517.36

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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.