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Finding the Fourth Proportional to 66,391.94, 91,575.32 and 39,513.72

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Solution

The fourth proportional to 66,391.94, 91,575.32 and 39,513.72 is: 54,501.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,391.94 : 91,575.32 = 39,513.72 : x
  2. Step 2: Convert to fraction form
    66,391.94/91,575.32 = 39,513.72/x
  3. Step 3: Cross multiply
    66,391.94x = 91,575.32 × 39,513.72
  4. Step 4: Simplify right side
    66,391.94x = 3,618,481,553.39
  5. Step 5: Solve for x
    x = 3,618,481,553.39/66,391.94
  6. Step 6: Final answer
    x = 54,501.82

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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.