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Finding the Fourth Proportional to 81,883.86, 121,980.70 and 79,405.86

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Solution

The fourth proportional to 81,883.86, 121,980.70 and 79,405.86 is: 118,289.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,883.86 : 121,980.70 = 79,405.86 : x
  2. Step 2: Convert to fraction form
    81,883.86/121,980.70 = 79,405.86/x
  3. Step 3: Cross multiply
    81,883.86x = 121,980.70 × 79,405.86
  4. Step 4: Simplify right side
    81,883.86x = 9,685,982,386.90
  5. Step 5: Solve for x
    x = 9,685,982,386.90/81,883.86
  6. Step 6: Final answer
    x = 118,289.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.