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Finding the Fourth Proportional to 421.26, 630.22 and 395.34

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Solution

The fourth proportional to 421.26, 630.22 and 395.34 is: 591.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.26 : 630.22 = 395.34 : x
  2. Step 2: Convert to fraction form
    421.26/630.22 = 395.34/x
  3. Step 3: Cross multiply
    421.26x = 630.22 × 395.34
  4. Step 4: Simplify right side
    421.26x = 249,151.17
  5. Step 5: Solve for x
    x = 249,151.17/421.26
  6. Step 6: Final answer
    x = 591.44

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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.