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Finding the Fourth Proportional to 66,736.80, 92,103.08 and 39,878.74

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Solution

The fourth proportional to 66,736.80, 92,103.08 and 39,878.74 is: 55,036.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,736.80 : 92,103.08 = 39,878.74 : x
  2. Step 2: Convert to fraction form
    66,736.80/92,103.08 = 39,878.74/x
  3. Step 3: Cross multiply
    66,736.80x = 92,103.08 × 39,878.74
  4. Step 4: Simplify right side
    66,736.80x = 3,672,954,780.52
  5. Step 5: Solve for x
    x = 3,672,954,780.52/66,736.80
  6. Step 6: Final answer
    x = 55,036.42

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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.