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Finding the Fourth Proportional to 66,505.28, 91,780.80 and 38,212.80

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Solution

The fourth proportional to 66,505.28, 91,780.80 and 38,212.80 is: 52,735.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,505.28 : 91,780.80 = 38,212.80 : x
  2. Step 2: Convert to fraction form
    66,505.28/91,780.80 = 38,212.80/x
  3. Step 3: Cross multiply
    66,505.28x = 91,780.80 × 38,212.80
  4. Step 4: Simplify right side
    66,505.28x = 3,507,201,354.24
  5. Step 5: Solve for x
    x = 3,507,201,354.24/66,505.28
  6. Step 6: Final answer
    x = 52,735.68

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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.