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Finding the Fourth Proportional to 405.02, 558.90 and 239.19

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Solution

The fourth proportional to 405.02, 558.90 and 239.19 is: 330.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.02 : 558.90 = 239.19 : x
  2. Step 2: Convert to fraction form
    405.02/558.90 = 239.19/x
  3. Step 3: Cross multiply
    405.02x = 558.90 × 239.19
  4. Step 4: Simplify right side
    405.02x = 133,683.29
  5. Step 5: Solve for x
    x = 133,683.29/405.02
  6. Step 6: Final answer
    x = 330.07

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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.