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Finding the Fourth Proportional to 2,485.68, 3,728.49 and 636.78

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Solution

The fourth proportional to 2,485.68, 3,728.49 and 636.78 is: 955.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,485.68 : 3,728.49 = 636.78 : x
  2. Step 2: Convert to fraction form
    2,485.68/3,728.49 = 636.78/x
  3. Step 3: Cross multiply
    2,485.68x = 3,728.49 × 636.78
  4. Step 4: Simplify right side
    2,485.68x = 2,374,227.86
  5. Step 5: Solve for x
    x = 2,374,227.86/2,485.68
  6. Step 6: Final answer
    x = 955.16

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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.