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Finding the Fourth Proportional to 405.93, 609.90 and 259.75

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Solution

The fourth proportional to 405.93, 609.90 and 259.75 is: 390.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.93 : 609.90 = 259.75 : x
  2. Step 2: Convert to fraction form
    405.93/609.90 = 259.75/x
  3. Step 3: Cross multiply
    405.93x = 609.90 × 259.75
  4. Step 4: Simplify right side
    405.93x = 158,421.53
  5. Step 5: Solve for x
    x = 158,421.53/405.93
  6. Step 6: Final answer
    x = 390.27

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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.