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Finding the Fourth Proportional to 438.60, 657.48 and 219.08

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Solution

The fourth proportional to 438.60, 657.48 and 219.08 is: 328.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.60 : 657.48 = 219.08 : x
  2. Step 2: Convert to fraction form
    438.60/657.48 = 219.08/x
  3. Step 3: Cross multiply
    438.60x = 657.48 × 219.08
  4. Step 4: Simplify right side
    438.60x = 144,040.72
  5. Step 5: Solve for x
    x = 144,040.72/438.60
  6. Step 6: Final answer
    x = 328.41

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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.