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Finding the Fourth Proportional to 66,425, 91,666.50 and 38,139.80

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Solution

The fourth proportional to 66,425, 91,666.50 and 38,139.80 is: 52,632.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,425 : 91,666.50 = 38,139.80 : x
  2. Step 2: Convert to fraction form
    66,425/91,666.50 = 38,139.80/x
  3. Step 3: Cross multiply
    66,425x = 91,666.50 × 38,139.80
  4. Step 4: Simplify right side
    66,425x = 3,496,141,976.70
  5. Step 5: Solve for x
    x = 3,496,141,976.70/66,425
  6. Step 6: Final answer
    x = 52,632.92

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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.