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Finding the Fourth Proportional to 388.89, 536.91 and 258.12

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Solution

The fourth proportional to 388.89, 536.91 and 258.12 is: 356.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.89 : 536.91 = 258.12 : x
  2. Step 2: Convert to fraction form
    388.89/536.91 = 258.12/x
  3. Step 3: Cross multiply
    388.89x = 536.91 × 258.12
  4. Step 4: Simplify right side
    388.89x = 138,587.21
  5. Step 5: Solve for x
    x = 138,587.21/388.89
  6. Step 6: Final answer
    x = 356.37

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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.