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Finding the Fourth Proportional to 84,000.60, 125,855.10 and 78,751.80

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Solution

The fourth proportional to 84,000.60, 125,855.10 and 78,751.80 is: 117,991.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,000.60 : 125,855.10 = 78,751.80 : x
  2. Step 2: Convert to fraction form
    84,000.60/125,855.10 = 78,751.80/x
  3. Step 3: Cross multiply
    84,000.60x = 125,855.10 × 78,751.80
  4. Step 4: Simplify right side
    84,000.60x = 9,911,315,664.18
  5. Step 5: Solve for x
    x = 9,911,315,664.18/84,000.60
  6. Step 6: Final answer
    x = 117,991.01

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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.