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Finding the Fourth Proportional to 852.71, 1,279.49 and 419.85

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Solution

The fourth proportional to 852.71, 1,279.49 and 419.85 is: 629.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.71 : 1,279.49 = 419.85 : x
  2. Step 2: Convert to fraction form
    852.71/1,279.49 = 419.85/x
  3. Step 3: Cross multiply
    852.71x = 1,279.49 × 419.85
  4. Step 4: Simplify right side
    852.71x = 537,191.78
  5. Step 5: Solve for x
    x = 537,191.78/852.71
  6. Step 6: Final answer
    x = 629.99

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Double scale
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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.