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Finding the Fourth Proportional to 128,525.40, 192,788.10 and 83,424.60

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Solution

The fourth proportional to 128,525.40, 192,788.10 and 83,424.60 is: 125,136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,525.40 : 192,788.10 = 83,424.60 : x
  2. Step 2: Convert to fraction form
    128,525.40/192,788.10 = 83,424.60/x
  3. Step 3: Cross multiply
    128,525.40x = 192,788.10 × 83,424.60
  4. Step 4: Simplify right side
    128,525.40x = 16,083,270,127.26
  5. Step 5: Solve for x
    x = 16,083,270,127.26/128,525.40
  6. Step 6: Final answer
    x = 125,136.90

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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.