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Finding the Fourth Proportional to 65,447.71, 90,315.36 and 39,996.64

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Solution

The fourth proportional to 65,447.71, 90,315.36 and 39,996.64 is: 55,193.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,447.71 : 90,315.36 = 39,996.64 : x
  2. Step 2: Convert to fraction form
    65,447.71/90,315.36 = 39,996.64/x
  3. Step 3: Cross multiply
    65,447.71x = 90,315.36 × 39,996.64
  4. Step 4: Simplify right side
    65,447.71x = 3,612,310,940.39
  5. Step 5: Solve for x
    x = 3,612,310,940.39/65,447.71
  6. Step 6: Final answer
    x = 55,193.85

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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.