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Finding the Fourth Proportional to 81,262.80, 121,894.20 and 57,643.20

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Solution

The fourth proportional to 81,262.80, 121,894.20 and 57,643.20 is: 86,464.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,262.80 : 121,894.20 = 57,643.20 : x
  2. Step 2: Convert to fraction form
    81,262.80/121,894.20 = 57,643.20/x
  3. Step 3: Cross multiply
    81,262.80x = 121,894.20 × 57,643.20
  4. Step 4: Simplify right side
    81,262.80x = 7,026,371,749.44
  5. Step 5: Solve for x
    x = 7,026,371,749.44/81,262.80
  6. Step 6: Final answer
    x = 86,464.80

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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.