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Finding the Fourth Proportional to 66,421.58, 91,661.69 and 36,206.96

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Solution

The fourth proportional to 66,421.58, 91,661.69 and 36,206.96 is: 49,965.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.58 : 91,661.69 = 36,206.96 : x
  2. Step 2: Convert to fraction form
    66,421.58/91,661.69 = 36,206.96/x
  3. Step 3: Cross multiply
    66,421.58x = 91,661.69 × 36,206.96
  4. Step 4: Simplify right side
    66,421.58x = 3,318,790,962.33
  5. Step 5: Solve for x
    x = 3,318,790,962.33/66,421.58
  6. Step 6: Final answer
    x = 49,965.55

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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.