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Finding the Fourth Proportional to 1,915.49, 2,872.42 and 683.21

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Solution

The fourth proportional to 1,915.49, 2,872.42 and 683.21 is: 1,024.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.49 : 2,872.42 = 683.21 : x
  2. Step 2: Convert to fraction form
    1,915.49/2,872.42 = 683.21/x
  3. Step 3: Cross multiply
    1,915.49x = 2,872.42 × 683.21
  4. Step 4: Simplify right side
    1,915.49x = 1,962,466.07
  5. Step 5: Solve for x
    x = 1,962,466.07/1,915.49
  6. Step 6: Final answer
    x = 1,024.52

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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.