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Finding the Fourth Proportional to 405.84, 608.40 and 162.21

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Solution

The fourth proportional to 405.84, 608.40 and 162.21 is: 243.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.84 : 608.40 = 162.21 : x
  2. Step 2: Convert to fraction form
    405.84/608.40 = 162.21/x
  3. Step 3: Cross multiply
    405.84x = 608.40 × 162.21
  4. Step 4: Simplify right side
    405.84x = 98,688.56
  5. Step 5: Solve for x
    x = 98,688.56/405.84
  6. Step 6: Final answer
    x = 243.17

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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.