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Finding the Fourth Proportional to 81,995.40, 122,993.10 and 54,001.80

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Solution

The fourth proportional to 81,995.40, 122,993.10 and 54,001.80 is: 81,002.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,995.40 : 122,993.10 = 54,001.80 : x
  2. Step 2: Convert to fraction form
    81,995.40/122,993.10 = 54,001.80/x
  3. Step 3: Cross multiply
    81,995.40x = 122,993.10 × 54,001.80
  4. Step 4: Simplify right side
    81,995.40x = 6,641,848,787.58
  5. Step 5: Solve for x
    x = 6,641,848,787.58/81,995.40
  6. Step 6: Final answer
    x = 81,002.70

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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.