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Finding the Fourth Proportional to 84,722.80, 126,938.40 and 55,125.40

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Solution

The fourth proportional to 84,722.80, 126,938.40 and 55,125.40 is: 82,593.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,722.80 : 126,938.40 = 55,125.40 : x
  2. Step 2: Convert to fraction form
    84,722.80/126,938.40 = 55,125.40/x
  3. Step 3: Cross multiply
    84,722.80x = 126,938.40 × 55,125.40
  4. Step 4: Simplify right side
    84,722.80x = 6,997,530,075.36
  5. Step 5: Solve for x
    x = 6,997,530,075.36/84,722.80
  6. Step 6: Final answer
    x = 82,593.23

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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.