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Finding the Fourth Proportional to 405.68, 609.48 and 388.88

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Solution

The fourth proportional to 405.68, 609.48 and 388.88 is: 584.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.68 : 609.48 = 388.88 : x
  2. Step 2: Convert to fraction form
    405.68/609.48 = 388.88/x
  3. Step 3: Cross multiply
    405.68x = 609.48 × 388.88
  4. Step 4: Simplify right side
    405.68x = 237,014.58
  5. Step 5: Solve for x
    x = 237,014.58/405.68
  6. Step 6: Final answer
    x = 584.24

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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.