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Finding the Fourth Proportional to 843.33, 1,261.20 and 645.72

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Solution

The fourth proportional to 843.33, 1,261.20 and 645.72 is: 965.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.33 : 1,261.20 = 645.72 : x
  2. Step 2: Convert to fraction form
    843.33/1,261.20 = 645.72/x
  3. Step 3: Cross multiply
    843.33x = 1,261.20 × 645.72
  4. Step 4: Simplify right side
    843.33x = 814,382.06
  5. Step 5: Solve for x
    x = 814,382.06/843.33
  6. Step 6: Final answer
    x = 965.67

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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.