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Finding the Fourth Proportional to 438.16, 656.51 and 218.55

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Solution

The fourth proportional to 438.16, 656.51 and 218.55 is: 327.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.16 : 656.51 = 218.55 : x
  2. Step 2: Convert to fraction form
    438.16/656.51 = 218.55/x
  3. Step 3: Cross multiply
    438.16x = 656.51 × 218.55
  4. Step 4: Simplify right side
    438.16x = 143,477.94
  5. Step 5: Solve for x
    x = 143,477.94/438.16
  6. Step 6: Final answer
    x = 327.46

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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.