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Finding the Fourth Proportional to 90,978.20, 125,559.16 and 50,698.52

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Solution

The fourth proportional to 90,978.20, 125,559.16 and 50,698.52 is: 69,969.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,978.20 : 125,559.16 = 50,698.52 : x
  2. Step 2: Convert to fraction form
    90,978.20/125,559.16 = 50,698.52/x
  3. Step 3: Cross multiply
    90,978.20x = 125,559.16 × 50,698.52
  4. Step 4: Simplify right side
    90,978.20x = 6,365,663,584.44
  5. Step 5: Solve for x
    x = 6,365,663,584.44/90,978.20
  6. Step 6: Final answer
    x = 69,969.11

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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.