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Finding the Fourth Proportional to 670.85, 1,004.21 and 614.15

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Solution

The fourth proportional to 670.85, 1,004.21 and 614.15 is: 919.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.85 : 1,004.21 = 614.15 : x
  2. Step 2: Convert to fraction form
    670.85/1,004.21 = 614.15/x
  3. Step 3: Cross multiply
    670.85x = 1,004.21 × 614.15
  4. Step 4: Simplify right side
    670.85x = 616,735.57
  5. Step 5: Solve for x
    x = 616,735.57/670.85
  6. Step 6: Final answer
    x = 919.33

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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.