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Finding the Fourth Proportional to 405.15, 558.95 and 239.31

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Solution

The fourth proportional to 405.15, 558.95 and 239.31 is: 330.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.15 : 558.95 = 239.31 : x
  2. Step 2: Convert to fraction form
    405.15/558.95 = 239.31/x
  3. Step 3: Cross multiply
    405.15x = 558.95 × 239.31
  4. Step 4: Simplify right side
    405.15x = 133,761.13
  5. Step 5: Solve for x
    x = 133,761.13/405.15
  6. Step 6: Final answer
    x = 330.15

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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.