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Finding the Fourth Proportional to 66,271.97, 91,425.11 and 39,399.21

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Solution

The fourth proportional to 66,271.97, 91,425.11 and 39,399.21 is: 54,352.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,271.97 : 91,425.11 = 39,399.21 : x
  2. Step 2: Convert to fraction form
    66,271.97/91,425.11 = 39,399.21/x
  3. Step 3: Cross multiply
    66,271.97x = 91,425.11 × 39,399.21
  4. Step 4: Simplify right side
    66,271.97x = 3,602,076,911.17
  5. Step 5: Solve for x
    x = 3,602,076,911.17/66,271.97
  6. Step 6: Final answer
    x = 54,352.95

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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.