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Finding the Fourth Proportional to 388.70, 536.63 and 257.94

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Solution

The fourth proportional to 388.70, 536.63 and 257.94 is: 356.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.70 : 536.63 = 257.94 : x
  2. Step 2: Convert to fraction form
    388.70/536.63 = 257.94/x
  3. Step 3: Cross multiply
    388.70x = 536.63 × 257.94
  4. Step 4: Simplify right side
    388.70x = 138,418.34
  5. Step 5: Solve for x
    x = 138,418.34/388.70
  6. Step 6: Final answer
    x = 356.11

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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.