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Finding the Fourth Proportional to 30,349.60, 41,903.76 and 20,939.68

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Solution

The fourth proportional to 30,349.60, 41,903.76 and 20,939.68 is: 28,911.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,349.60 : 41,903.76 = 20,939.68 : x
  2. Step 2: Convert to fraction form
    30,349.60/41,903.76 = 20,939.68/x
  3. Step 3: Cross multiply
    30,349.60x = 41,903.76 × 20,939.68
  4. Step 4: Simplify right side
    30,349.60x = 877,451,325.20
  5. Step 5: Solve for x
    x = 877,451,325.20/30,349.60
  6. Step 6: Final answer
    x = 28,911.46

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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.