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Finding the Fourth Proportional to 31,487.92, 43,451.76 and 20,309.92

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Solution

The fourth proportional to 31,487.92, 43,451.76 and 20,309.92 is: 28,026.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,487.92 : 43,451.76 = 20,309.92 : x
  2. Step 2: Convert to fraction form
    31,487.92/43,451.76 = 20,309.92/x
  3. Step 3: Cross multiply
    31,487.92x = 43,451.76 × 20,309.92
  4. Step 4: Simplify right side
    31,487.92x = 882,501,769.46
  5. Step 5: Solve for x
    x = 882,501,769.46/31,487.92
  6. Step 6: Final answer
    x = 28,026.68

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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.