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Finding the Fourth Proportional to 305.65, 421.63 and 212.23

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Solution

The fourth proportional to 305.65, 421.63 and 212.23 is: 292.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.65 : 421.63 = 212.23 : x
  2. Step 2: Convert to fraction form
    305.65/421.63 = 212.23/x
  3. Step 3: Cross multiply
    305.65x = 421.63 × 212.23
  4. Step 4: Simplify right side
    305.65x = 89,482.53
  5. Step 5: Solve for x
    x = 89,482.53/305.65
  6. Step 6: Final answer
    x = 292.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.