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Finding the Fourth Proportional to 850.72, 1,274.40 and 667.20

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Solution

The fourth proportional to 850.72, 1,274.40 and 667.20 is: 999.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.72 : 1,274.40 = 667.20 : x
  2. Step 2: Convert to fraction form
    850.72/1,274.40 = 667.20/x
  3. Step 3: Cross multiply
    850.72x = 1,274.40 × 667.20
  4. Step 4: Simplify right side
    850.72x = 850,279.68
  5. Step 5: Solve for x
    x = 850,279.68/850.72
  6. Step 6: Final answer
    x = 999.48

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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.