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Finding the Fourth Proportional to 1,640.50, 2,461.16 and 486.25

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Solution

The fourth proportional to 1,640.50, 2,461.16 and 486.25 is: 729.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.50 : 2,461.16 = 486.25 : x
  2. Step 2: Convert to fraction form
    1,640.50/2,461.16 = 486.25/x
  3. Step 3: Cross multiply
    1,640.50x = 2,461.16 × 486.25
  4. Step 4: Simplify right side
    1,640.50x = 1,196,739.05
  5. Step 5: Solve for x
    x = 1,196,739.05/1,640.50
  6. Step 6: Final answer
    x = 729.50

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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.