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Finding the Fourth Proportional to 426.48, 636.88 and 421.91

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Solution

The fourth proportional to 426.48, 636.88 and 421.91 is: 630.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.48 : 636.88 = 421.91 : x
  2. Step 2: Convert to fraction form
    426.48/636.88 = 421.91/x
  3. Step 3: Cross multiply
    426.48x = 636.88 × 421.91
  4. Step 4: Simplify right side
    426.48x = 268,704.98
  5. Step 5: Solve for x
    x = 268,704.98/426.48
  6. Step 6: Final answer
    x = 630.05

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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.