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Finding the Fourth Proportional to 66,553.12, 91,810.15 and 39,676.69

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Solution

The fourth proportional to 66,553.12, 91,810.15 and 39,676.69 is: 54,734.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,553.12 : 91,810.15 = 39,676.69 : x
  2. Step 2: Convert to fraction form
    66,553.12/91,810.15 = 39,676.69/x
  3. Step 3: Cross multiply
    66,553.12x = 91,810.15 × 39,676.69
  4. Step 4: Simplify right side
    66,553.12x = 3,642,722,860.40
  5. Step 5: Solve for x
    x = 3,642,722,860.40/66,553.12
  6. Step 6: Final answer
    x = 54,734.07

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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.