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Finding the Fourth Proportional to 421.74, 632.71 and 212.99

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Solution

The fourth proportional to 421.74, 632.71 and 212.99 is: 319.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 632.71 = 212.99 : x
  2. Step 2: Convert to fraction form
    421.74/632.71 = 212.99/x
  3. Step 3: Cross multiply
    421.74x = 632.71 × 212.99
  4. Step 4: Simplify right side
    421.74x = 134,756.67
  5. Step 5: Solve for x
    x = 134,756.67/421.74
  6. Step 6: Final answer
    x = 319.53

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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.