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Finding the Fourth Proportional to 70,499.25, 105,748.88 and 21,251.25

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Solution

The fourth proportional to 70,499.25, 105,748.88 and 21,251.25 is: 31,876.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,499.25 : 105,748.88 = 21,251.25 : x
  2. Step 2: Convert to fraction form
    70,499.25/105,748.88 = 21,251.25/x
  3. Step 3: Cross multiply
    70,499.25x = 105,748.88 × 21,251.25
  4. Step 4: Simplify right side
    70,499.25x = 2,247,295,779.84
  5. Step 5: Solve for x
    x = 2,247,295,779.84/70,499.25
  6. Step 6: Final answer
    x = 31,876.88

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Similar ratio
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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.