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Finding the Fourth Proportional to 81,310.32, 121,935.13 and 27,987.21

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Solution

The fourth proportional to 81,310.32, 121,935.13 and 27,987.21 is: 41,970.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,310.32 : 121,935.13 = 27,987.21 : x
  2. Step 2: Convert to fraction form
    81,310.32/121,935.13 = 27,987.21/x
  3. Step 3: Cross multiply
    81,310.32x = 121,935.13 × 27,987.21
  4. Step 4: Simplify right side
    81,310.32x = 3,412,624,089.69
  5. Step 5: Solve for x
    x = 3,412,624,089.69/81,310.32
  6. Step 6: Final answer
    x = 41,970.37

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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.