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Finding the Fourth Proportional to 423.84, 636.16 and 325.40

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Solution

The fourth proportional to 423.84, 636.16 and 325.40 is: 488.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.84 : 636.16 = 325.40 : x
  2. Step 2: Convert to fraction form
    423.84/636.16 = 325.40/x
  3. Step 3: Cross multiply
    423.84x = 636.16 × 325.40
  4. Step 4: Simplify right side
    423.84x = 207,006.46
  5. Step 5: Solve for x
    x = 207,006.46/423.84
  6. Step 6: Final answer
    x = 488.41

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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.