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Finding the Fourth Proportional to 438.12, 653.94 and 329.40

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Solution

The fourth proportional to 438.12, 653.94 and 329.40 is: 491.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.12 : 653.94 = 329.40 : x
  2. Step 2: Convert to fraction form
    438.12/653.94 = 329.40/x
  3. Step 3: Cross multiply
    438.12x = 653.94 × 329.40
  4. Step 4: Simplify right side
    438.12x = 215,407.84
  5. Step 5: Solve for x
    x = 215,407.84/438.12
  6. Step 6: Final answer
    x = 491.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.