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Finding the Fourth Proportional to 638.40, 957.42 and 227.56

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Solution

The fourth proportional to 638.40, 957.42 and 227.56 is: 341.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.40 : 957.42 = 227.56 : x
  2. Step 2: Convert to fraction form
    638.40/957.42 = 227.56/x
  3. Step 3: Cross multiply
    638.40x = 957.42 × 227.56
  4. Step 4: Simplify right side
    638.40x = 217,870.50
  5. Step 5: Solve for x
    x = 217,870.50/638.40
  6. Step 6: Final answer
    x = 341.28

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1.5x scale

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.