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Finding the Fourth Proportional to 1,640.37, 2,460.65 and 486.21

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Solution

The fourth proportional to 1,640.37, 2,460.65 and 486.21 is: 729.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.37 : 2,460.65 = 486.21 : x
  2. Step 2: Convert to fraction form
    1,640.37/2,460.65 = 486.21/x
  3. Step 3: Cross multiply
    1,640.37x = 2,460.65 × 486.21
  4. Step 4: Simplify right side
    1,640.37x = 1,196,390.21
  5. Step 5: Solve for x
    x = 1,196,390.21/1,640.37
  6. Step 6: Final answer
    x = 729.34

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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.