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Finding the Fourth Proportional to 852.10, 1,276.89 and 487

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Solution

The fourth proportional to 852.10, 1,276.89 and 487 is: 729.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.10 : 1,276.89 = 487 : x
  2. Step 2: Convert to fraction form
    852.10/1,276.89 = 487/x
  3. Step 3: Cross multiply
    852.10x = 1,276.89 × 487
  4. Step 4: Simplify right side
    852.10x = 621,845.43
  5. Step 5: Solve for x
    x = 621,845.43/852.10
  6. Step 6: Final answer
    x = 729.78

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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.