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Finding the Fourth Proportional to 70,613.06, 105,905.22 and 20,679.74

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Solution

The fourth proportional to 70,613.06, 105,905.22 and 20,679.74 is: 31,015.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,613.06 : 105,905.22 = 20,679.74 : x
  2. Step 2: Convert to fraction form
    70,613.06/105,905.22 = 20,679.74/x
  3. Step 3: Cross multiply
    70,613.06x = 105,905.22 × 20,679.74
  4. Step 4: Simplify right side
    70,613.06x = 2,190,092,414.24
  5. Step 5: Solve for x
    x = 2,190,092,414.24/70,613.06
  6. Step 6: Final answer
    x = 31,015.40

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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.