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Finding the Fourth Proportional to 81,107.32, 121,660.98 and 25,699

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Solution

The fourth proportional to 81,107.32, 121,660.98 and 25,699 is: 38,548.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,107.32 : 121,660.98 = 25,699 : x
  2. Step 2: Convert to fraction form
    81,107.32/121,660.98 = 25,699/x
  3. Step 3: Cross multiply
    81,107.32x = 121,660.98 × 25,699
  4. Step 4: Simplify right side
    81,107.32x = 3,126,565,525.02
  5. Step 5: Solve for x
    x = 3,126,565,525.02/81,107.32
  6. Step 6: Final answer
    x = 38,548.50

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1.5x scale

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.