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Finding the Fourth Proportional to 388.40, 536 and 213.74

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Solution

The fourth proportional to 388.40, 536 and 213.74 is: 294.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.40 : 536 = 213.74 : x
  2. Step 2: Convert to fraction form
    388.40/536 = 213.74/x
  3. Step 3: Cross multiply
    388.40x = 536 × 213.74
  4. Step 4: Simplify right side
    388.40x = 114,564.64
  5. Step 5: Solve for x
    x = 114,564.64/388.40
  6. Step 6: Final answer
    x = 294.97

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Why These Related Problems?

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