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Finding the Fourth Proportional to 66,390, 91,619.64 and 36,582

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Solution

The fourth proportional to 66,390, 91,619.64 and 36,582 is: 50,483.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,390 : 91,619.64 = 36,582 : x
  2. Step 2: Convert to fraction form
    66,390/91,619.64 = 36,582/x
  3. Step 3: Cross multiply
    66,390x = 91,619.64 × 36,582
  4. Step 4: Simplify right side
    66,390x = 3,351,629,670.48
  5. Step 5: Solve for x
    x = 3,351,629,670.48/66,390
  6. Step 6: Final answer
    x = 50,483.95

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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.