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Finding the Fourth Proportional to 128,525.70, 192,788.55 and 39,806.40

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Solution

The fourth proportional to 128,525.70, 192,788.55 and 39,806.40 is: 59,709.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,525.70 : 192,788.55 = 39,806.40 : x
  2. Step 2: Convert to fraction form
    128,525.70/192,788.55 = 39,806.40/x
  3. Step 3: Cross multiply
    128,525.70x = 192,788.55 × 39,806.40
  4. Step 4: Simplify right side
    128,525.70x = 7,674,218,136.72
  5. Step 5: Solve for x
    x = 7,674,218,136.72/128,525.70
  6. Step 6: Final answer
    x = 59,709.60

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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.