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Finding the Fourth Proportional to 81,203.70, 121,805.55 and 76,698.10

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Solution

The fourth proportional to 81,203.70, 121,805.55 and 76,698.10 is: 115,047.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,203.70 : 121,805.55 = 76,698.10 : x
  2. Step 2: Convert to fraction form
    81,203.70/121,805.55 = 76,698.10/x
  3. Step 3: Cross multiply
    81,203.70x = 121,805.55 × 76,698.10
  4. Step 4: Simplify right side
    81,203.70x = 9,342,254,254.46
  5. Step 5: Solve for x
    x = 9,342,254,254.46/81,203.70
  6. Step 6: Final answer
    x = 115,047.15

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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.