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Finding the Fourth Proportional to 70,215.26, 105,322.87 and 28,114.30

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Solution

The fourth proportional to 70,215.26, 105,322.87 and 28,114.30 is: 42,171.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,215.26 : 105,322.87 = 28,114.30 : x
  2. Step 2: Convert to fraction form
    70,215.26/105,322.87 = 28,114.30/x
  3. Step 3: Cross multiply
    70,215.26x = 105,322.87 × 28,114.30
  4. Step 4: Simplify right side
    70,215.26x = 2,961,078,764.04
  5. Step 5: Solve for x
    x = 2,961,078,764.04/70,215.26
  6. Step 6: Final answer
    x = 42,171.44

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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.