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Finding the Fourth Proportional to 388.17, 535.67 and 213.51

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Solution

The fourth proportional to 388.17, 535.67 and 213.51 is: 294.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.17 : 535.67 = 213.51 : x
  2. Step 2: Convert to fraction form
    388.17/535.67 = 213.51/x
  3. Step 3: Cross multiply
    388.17x = 535.67 × 213.51
  4. Step 4: Simplify right side
    388.17x = 114,370.90
  5. Step 5: Solve for x
    x = 114,370.90/388.17
  6. Step 6: Final answer
    x = 294.65

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