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Finding the Fourth Proportional to 405.56, 559.33 and 239.72

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Solution

The fourth proportional to 405.56, 559.33 and 239.72 is: 330.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.56 : 559.33 = 239.72 : x
  2. Step 2: Convert to fraction form
    405.56/559.33 = 239.72/x
  3. Step 3: Cross multiply
    405.56x = 559.33 × 239.72
  4. Step 4: Simplify right side
    405.56x = 134,079.19
  5. Step 5: Solve for x
    x = 134,079.19/405.56
  6. Step 6: Final answer
    x = 330.60

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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.