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Finding the Fourth Proportional to 405.28, 606.48 and 378.16

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Solution

The fourth proportional to 405.28, 606.48 and 378.16 is: 565.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.28 : 606.48 = 378.16 : x
  2. Step 2: Convert to fraction form
    405.28/606.48 = 378.16/x
  3. Step 3: Cross multiply
    405.28x = 606.48 × 378.16
  4. Step 4: Simplify right side
    405.28x = 229,346.48
  5. Step 5: Solve for x
    x = 229,346.48/405.28
  6. Step 6: Final answer
    x = 565.90

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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.