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Finding the Fourth Proportional to 128,386.53, 192,608.91 and 69,220.89

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Solution

The fourth proportional to 128,386.53, 192,608.91 and 69,220.89 is: 103,847.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,386.53 : 192,608.91 = 69,220.89 : x
  2. Step 2: Convert to fraction form
    128,386.53/192,608.91 = 69,220.89/x
  3. Step 3: Cross multiply
    128,386.53x = 192,608.91 × 69,220.89
  4. Step 4: Simplify right side
    128,386.53x = 13,332,560,172.13
  5. Step 5: Solve for x
    x = 13,332,560,172.13/128,386.53
  6. Step 6: Final answer
    x = 103,847.03

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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.