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Finding the Fourth Proportional to 66,421.31, 91,661.42 and 36,206.60

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Solution

The fourth proportional to 66,421.31, 91,661.42 and 36,206.60 is: 49,965.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.31 : 91,661.42 = 36,206.60 : x
  2. Step 2: Convert to fraction form
    66,421.31/91,661.42 = 36,206.60/x
  3. Step 3: Cross multiply
    66,421.31x = 91,661.42 × 36,206.60
  4. Step 4: Simplify right side
    66,421.31x = 3,318,748,001.58
  5. Step 5: Solve for x
    x = 3,318,748,001.58/66,421.31
  6. Step 6: Final answer
    x = 49,965.11

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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.