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Finding the Fourth Proportional to 1,515.94, 2,274.12 and 638.30

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Solution

The fourth proportional to 1,515.94, 2,274.12 and 638.30 is: 957.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.94 : 2,274.12 = 638.30 : x
  2. Step 2: Convert to fraction form
    1,515.94/2,274.12 = 638.30/x
  3. Step 3: Cross multiply
    1,515.94x = 2,274.12 × 638.30
  4. Step 4: Simplify right side
    1,515.94x = 1,451,570.80
  5. Step 5: Solve for x
    x = 1,451,570.80/1,515.94
  6. Step 6: Final answer
    x = 957.54

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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.