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Finding the Fourth Proportional to 438.61, 657.98 and 219.18

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Solution

The fourth proportional to 438.61, 657.98 and 219.18 is: 328.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.61 : 657.98 = 219.18 : x
  2. Step 2: Convert to fraction form
    438.61/657.98 = 219.18/x
  3. Step 3: Cross multiply
    438.61x = 657.98 × 219.18
  4. Step 4: Simplify right side
    438.61x = 144,218.64
  5. Step 5: Solve for x
    x = 144,218.64/438.61
  6. Step 6: Final answer
    x = 328.81

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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.