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Finding the Fourth Proportional to 405.12, 558.72 and 331.44

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Solution

The fourth proportional to 405.12, 558.72 and 331.44 is: 457.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.12 : 558.72 = 331.44 : x
  2. Step 2: Convert to fraction form
    405.12/558.72 = 331.44/x
  3. Step 3: Cross multiply
    405.12x = 558.72 × 331.44
  4. Step 4: Simplify right side
    405.12x = 185,182.16
  5. Step 5: Solve for x
    x = 185,182.16/405.12
  6. Step 6: Final answer
    x = 457.10

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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.