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Finding the Fourth Proportional to 90,698.64, 125,120.56 and 78,101.52

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Solution

The fourth proportional to 90,698.64, 125,120.56 and 78,101.52 is: 107,742.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,698.64 : 125,120.56 = 78,101.52 : x
  2. Step 2: Convert to fraction form
    90,698.64/125,120.56 = 78,101.52/x
  3. Step 3: Cross multiply
    90,698.64x = 125,120.56 × 78,101.52
  4. Step 4: Simplify right side
    90,698.64x = 9,772,105,919.25
  5. Step 5: Solve for x
    x = 9,772,105,919.25/90,698.64
  6. Step 6: Final answer
    x = 107,742.58

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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.