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Finding the Fourth Proportional to 90,729, 125,206.02 and 50,985

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Solution

The fourth proportional to 90,729, 125,206.02 and 50,985 is: 70,359.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,729 : 125,206.02 = 50,985 : x
  2. Step 2: Convert to fraction form
    90,729/125,206.02 = 50,985/x
  3. Step 3: Cross multiply
    90,729x = 125,206.02 × 50,985
  4. Step 4: Simplify right side
    90,729x = 6,383,628,929.70
  5. Step 5: Solve for x
    x = 6,383,628,929.70/90,729
  6. Step 6: Final answer
    x = 70,359.30

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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.