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Finding the Fourth Proportional to 2,485.74, 3,728.55 and 636.82

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Solution

The fourth proportional to 2,485.74, 3,728.55 and 636.82 is: 955.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,485.74 : 3,728.55 = 636.82 : x
  2. Step 2: Convert to fraction form
    2,485.74/3,728.55 = 636.82/x
  3. Step 3: Cross multiply
    2,485.74x = 3,728.55 × 636.82
  4. Step 4: Simplify right side
    2,485.74x = 2,374,415.21
  5. Step 5: Solve for x
    x = 2,374,415.21/2,485.74
  6. Step 6: Final answer
    x = 955.21

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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.