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Finding the Fourth Proportional to 40,079.86, 55,308.86 and 21,930.50

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Solution

The fourth proportional to 40,079.86, 55,308.86 and 21,930.50 is: 30,263.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,079.86 : 55,308.86 = 21,930.50 : x
  2. Step 2: Convert to fraction form
    40,079.86/55,308.86 = 21,930.50/x
  3. Step 3: Cross multiply
    40,079.86x = 55,308.86 × 21,930.50
  4. Step 4: Simplify right side
    40,079.86x = 1,212,950,954.23
  5. Step 5: Solve for x
    x = 1,212,950,954.23/40,079.86
  6. Step 6: Final answer
    x = 30,263.35

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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.