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Finding the Fourth Proportional to 623.40, 935.18 and 212.42

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Solution

The fourth proportional to 623.40, 935.18 and 212.42 is: 318.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.40 : 935.18 = 212.42 : x
  2. Step 2: Convert to fraction form
    623.40/935.18 = 212.42/x
  3. Step 3: Cross multiply
    623.40x = 935.18 × 212.42
  4. Step 4: Simplify right side
    623.40x = 198,653.01
  5. Step 5: Solve for x
    x = 198,653.01/623.40
  6. Step 6: Final answer
    x = 318.66

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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.