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Finding the Fourth Proportional to 683.90, 1,027.02 and 653.12

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Solution

The fourth proportional to 683.90, 1,027.02 and 653.12 is: 980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.90 : 1,027.02 = 653.12 : x
  2. Step 2: Convert to fraction form
    683.90/1,027.02 = 653.12/x
  3. Step 3: Cross multiply
    683.90x = 1,027.02 × 653.12
  4. Step 4: Simplify right side
    683.90x = 670,767.30
  5. Step 5: Solve for x
    x = 670,767.30/683.90
  6. Step 6: Final answer
    x = 980.80

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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.