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Finding the Fourth Proportional to 438.54, 657.30 and 218.70

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Solution

The fourth proportional to 438.54, 657.30 and 218.70 is: 327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.54 : 657.30 = 218.70 : x
  2. Step 2: Convert to fraction form
    438.54/657.30 = 218.70/x
  3. Step 3: Cross multiply
    438.54x = 657.30 × 218.70
  4. Step 4: Simplify right side
    438.54x = 143,751.51
  5. Step 5: Solve for x
    x = 143,751.51/438.54
  6. Step 6: Final answer
    x = 327.80

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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.