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Finding the Fourth Proportional to 125,105.50, 172,645.59 and 80,393.50

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Solution

The fourth proportional to 125,105.50, 172,645.59 and 80,393.50 is: 110,943.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,105.50 : 172,645.59 = 80,393.50 : x
  2. Step 2: Convert to fraction form
    125,105.50/172,645.59 = 80,393.50/x
  3. Step 3: Cross multiply
    125,105.50x = 172,645.59 × 80,393.50
  4. Step 4: Simplify right side
    125,105.50x = 13,879,583,239.67
  5. Step 5: Solve for x
    x = 13,879,583,239.67/125,105.50
  6. Step 6: Final answer
    x = 110,943.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.