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Finding the Fourth Proportional to 623.60, 935.70 and 212.78

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Solution

The fourth proportional to 623.60, 935.70 and 212.78 is: 319.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.60 : 935.70 = 212.78 : x
  2. Step 2: Convert to fraction form
    623.60/935.70 = 212.78/x
  3. Step 3: Cross multiply
    623.60x = 935.70 × 212.78
  4. Step 4: Simplify right side
    623.60x = 199,098.25
  5. Step 5: Solve for x
    x = 199,098.25/623.60
  6. Step 6: Final answer
    x = 319.27

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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.