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Finding the Fourth Proportional to 100,342.74, 150,218.85 and 66,980.05

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Solution

The fourth proportional to 100,342.74, 150,218.85 and 66,980.05 is: 100,272.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,342.74 : 150,218.85 = 66,980.05 : x
  2. Step 2: Convert to fraction form
    100,342.74/150,218.85 = 66,980.05/x
  3. Step 3: Cross multiply
    100,342.74x = 150,218.85 × 66,980.05
  4. Step 4: Simplify right side
    100,342.74x = 10,061,665,749.04
  5. Step 5: Solve for x
    x = 10,061,665,749.04/100,342.74
  6. Step 6: Final answer
    x = 100,272.99

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1.5x scale

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.