Home / 81,261.40-121,964.10-47,939.80

Finding the Fourth Proportional to 81,261.40, 121,964.10 and 47,939.80

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Solution

The fourth proportional to 81,261.40, 121,964.10 and 47,939.80 is: 71,952.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,261.40 : 121,964.10 = 47,939.80 : x
  2. Step 2: Convert to fraction form
    81,261.40/121,964.10 = 47,939.80/x
  3. Step 3: Cross multiply
    81,261.40x = 121,964.10 × 47,939.80
  4. Step 4: Simplify right side
    81,261.40x = 5,846,934,561.18
  5. Step 5: Solve for x
    x = 5,846,934,561.18/81,261.40
  6. Step 6: Final answer
    x = 71,952.18

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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.