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Finding the Fourth Proportional to 405.50, 559.68 and 258.11

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Solution

The fourth proportional to 405.50, 559.68 and 258.11 is: 356.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.50 : 559.68 = 258.11 : x
  2. Step 2: Convert to fraction form
    405.50/559.68 = 258.11/x
  3. Step 3: Cross multiply
    405.50x = 559.68 × 258.11
  4. Step 4: Simplify right side
    405.50x = 144,456.21
  5. Step 5: Solve for x
    x = 144,456.21/405.50
  6. Step 6: Final answer
    x = 356.25

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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.