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Finding the Fourth Proportional to 421.68, 635 and 368.22

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Solution

The fourth proportional to 421.68, 635 and 368.22 is: 554.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.68 : 635 = 368.22 : x
  2. Step 2: Convert to fraction form
    421.68/635 = 368.22/x
  3. Step 3: Cross multiply
    421.68x = 635 × 368.22
  4. Step 4: Simplify right side
    421.68x = 233,819.70
  5. Step 5: Solve for x
    x = 233,819.70/421.68
  6. Step 6: Final answer
    x = 554.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.