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Finding the Fourth Proportional to 70,131.44, 105,238.80 and 28,031.44

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Solution

The fourth proportional to 70,131.44, 105,238.80 and 28,031.44 is: 42,063.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,131.44 : 105,238.80 = 28,031.44 : x
  2. Step 2: Convert to fraction form
    70,131.44/105,238.80 = 28,031.44/x
  3. Step 3: Cross multiply
    70,131.44x = 105,238.80 × 28,031.44
  4. Step 4: Simplify right side
    70,131.44x = 2,949,995,107.87
  5. Step 5: Solve for x
    x = 2,949,995,107.87/70,131.44
  6. Step 6: Final answer
    x = 42,063.80

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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.