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Finding the Fourth Proportional to 405.52, 607.90 and 162.21

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Solution

The fourth proportional to 405.52, 607.90 and 162.21 is: 243.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.52 : 607.90 = 162.21 : x
  2. Step 2: Convert to fraction form
    405.52/607.90 = 162.21/x
  3. Step 3: Cross multiply
    405.52x = 607.90 × 162.21
  4. Step 4: Simplify right side
    405.52x = 98,607.46
  5. Step 5: Solve for x
    x = 98,607.46/405.52
  6. Step 6: Final answer
    x = 243.16

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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.