Home / 128,639.10-192,977.33-39,899.76

Finding the Fourth Proportional to 128,639.10, 192,977.33 and 39,899.76

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Solution

The fourth proportional to 128,639.10, 192,977.33 and 39,899.76 is: 59,855.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.10 : 192,977.33 = 39,899.76 : x
  2. Step 2: Convert to fraction form
    128,639.10/192,977.33 = 39,899.76/x
  3. Step 3: Cross multiply
    128,639.10x = 192,977.33 × 39,899.76
  4. Step 4: Simplify right side
    128,639.10x = 7,699,749,152.44
  5. Step 5: Solve for x
    x = 7,699,749,152.44/128,639.10
  6. Step 6: Final answer
    x = 59,855.43

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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.