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Finding the Fourth Proportional to 29,481.70, 40,615.55 and 20,513.78

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Solution

The fourth proportional to 29,481.70, 40,615.55 and 20,513.78 is: 28,260.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,481.70 : 40,615.55 = 20,513.78 : x
  2. Step 2: Convert to fraction form
    29,481.70/40,615.55 = 20,513.78/x
  3. Step 3: Cross multiply
    29,481.70x = 40,615.55 × 20,513.78
  4. Step 4: Simplify right side
    29,481.70x = 833,178,457.28
  5. Step 5: Solve for x
    x = 833,178,457.28/29,481.70
  6. Step 6: Final answer
    x = 28,260.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.