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Finding the Fourth Proportional to 405, 606.36 and 258.39

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Solution

The fourth proportional to 405, 606.36 and 258.39 is: 386.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    405 : 606.36 = 258.39 : x
  2. Step 2: Convert to fraction form
    405/606.36 = 258.39/x
  3. Step 3: Cross multiply
    405x = 606.36 × 258.39
  4. Step 4: Simplify right side
    405x = 156,677.36
  5. Step 5: Solve for x
    x = 156,677.36/405
  6. Step 6: Final answer
    x = 386.86

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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.