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Finding the Fourth Proportional to 39,485.42, 54,489.88 and 21,580.42

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Solution

The fourth proportional to 39,485.42, 54,489.88 and 21,580.42 is: 29,780.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,485.42 : 54,489.88 = 21,580.42 : x
  2. Step 2: Convert to fraction form
    39,485.42/54,489.88 = 21,580.42/x
  3. Step 3: Cross multiply
    39,485.42x = 54,489.88 × 21,580.42
  4. Step 4: Simplify right side
    39,485.42x = 1,175,914,496.15
  5. Step 5: Solve for x
    x = 1,175,914,496.15/39,485.42
  6. Step 6: Final answer
    x = 29,780.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.