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Finding the Fourth Proportional to 128,219.90, 192,487.80 and 80,834.90

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Solution

The fourth proportional to 128,219.90, 192,487.80 and 80,834.90 is: 121,351.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,219.90 : 192,487.80 = 80,834.90 : x
  2. Step 2: Convert to fraction form
    128,219.90/192,487.80 = 80,834.90/x
  3. Step 3: Cross multiply
    128,219.90x = 192,487.80 × 80,834.90
  4. Step 4: Simplify right side
    128,219.90x = 15,559,732,064.22
  5. Step 5: Solve for x
    x = 15,559,732,064.22/128,219.90
  6. Step 6: Final answer
    x = 121,351.93

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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.