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Finding the Fourth Proportional to 66,638.80, 91,962.48 and 39,793.60

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Solution

The fourth proportional to 66,638.80, 91,962.48 and 39,793.60 is: 54,915.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,638.80 : 91,962.48 = 39,793.60 : x
  2. Step 2: Convert to fraction form
    66,638.80/91,962.48 = 39,793.60/x
  3. Step 3: Cross multiply
    66,638.80x = 91,962.48 × 39,793.60
  4. Step 4: Simplify right side
    66,638.80x = 3,659,518,144.13
  5. Step 5: Solve for x
    x = 3,659,518,144.13/66,638.80
  6. Step 6: Final answer
    x = 54,915.73

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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.