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Finding the Fourth Proportional to 90,741.40, 135,917.70 and 73,245.40

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Solution

The fourth proportional to 90,741.40, 135,917.70 and 73,245.40 is: 109,711.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,741.40 : 135,917.70 = 73,245.40 : x
  2. Step 2: Convert to fraction form
    90,741.40/135,917.70 = 73,245.40/x
  3. Step 3: Cross multiply
    90,741.40x = 135,917.70 × 73,245.40
  4. Step 4: Simplify right side
    90,741.40x = 9,955,346,303.58
  5. Step 5: Solve for x
    x = 9,955,346,303.58/90,741.40
  6. Step 6: Final answer
    x = 109,711.18

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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.