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Finding the Fourth Proportional to 54,221.60, 81,308.10 and 20,930.60

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Solution

The fourth proportional to 54,221.60, 81,308.10 and 20,930.60 is: 31,386.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,221.60 : 81,308.10 = 20,930.60 : x
  2. Step 2: Convert to fraction form
    54,221.60/81,308.10 = 20,930.60/x
  3. Step 3: Cross multiply
    54,221.60x = 81,308.10 × 20,930.60
  4. Step 4: Simplify right side
    54,221.60x = 1,701,827,317.86
  5. Step 5: Solve for x
    x = 1,701,827,317.86/54,221.60
  6. Step 6: Final answer
    x = 31,386.52

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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.