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Finding the Fourth Proportional to 31,499.28, 43,487.08 and 20,903.28

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Solution

The fourth proportional to 31,499.28, 43,487.08 and 20,903.28 is: 28,858.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,499.28 : 43,487.08 = 20,903.28 : x
  2. Step 2: Convert to fraction form
    31,499.28/43,487.08 = 20,903.28/x
  3. Step 3: Cross multiply
    31,499.28x = 43,487.08 × 20,903.28
  4. Step 4: Simplify right side
    31,499.28x = 909,022,609.62
  5. Step 5: Solve for x
    x = 909,022,609.62/31,499.28
  6. Step 6: Final answer
    x = 28,858.52

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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.