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Finding the Fourth Proportional to 852.71, 1,279.36 and 487.80

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Solution

The fourth proportional to 852.71, 1,279.36 and 487.80 is: 731.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.71 : 1,279.36 = 487.80 : x
  2. Step 2: Convert to fraction form
    852.71/1,279.36 = 487.80/x
  3. Step 3: Cross multiply
    852.71x = 1,279.36 × 487.80
  4. Step 4: Simplify right side
    852.71x = 624,071.81
  5. Step 5: Solve for x
    x = 624,071.81/852.71
  6. Step 6: Final answer
    x = 731.87

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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.