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Finding the Fourth Proportional to 66,421.84, 91,661.52 and 36,207.12

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Solution

The fourth proportional to 66,421.84, 91,661.52 and 36,207.12 is: 49,965.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.84 : 91,661.52 = 36,207.12 : x
  2. Step 2: Convert to fraction form
    66,421.84/91,661.52 = 36,207.12/x
  3. Step 3: Cross multiply
    66,421.84x = 91,661.52 × 36,207.12
  4. Step 4: Simplify right side
    66,421.84x = 3,318,799,654.02
  5. Step 5: Solve for x
    x = 3,318,799,654.02/66,421.84
  6. Step 6: Final answer
    x = 49,965.49

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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.