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Finding the Fourth Proportional to 91,878.76, 137,825.70 and 39,288.70

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Solution

The fourth proportional to 91,878.76, 137,825.70 and 39,288.70 is: 58,936.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,878.76 : 137,825.70 = 39,288.70 : x
  2. Step 2: Convert to fraction form
    91,878.76/137,825.70 = 39,288.70/x
  3. Step 3: Cross multiply
    91,878.76x = 137,825.70 × 39,288.70
  4. Step 4: Simplify right side
    91,878.76x = 5,414,992,579.59
  5. Step 5: Solve for x
    x = 5,414,992,579.59/91,878.76
  6. Step 6: Final answer
    x = 58,936.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.