Home / 128,636.10-193,167.99-86,785.43

Finding the Fourth Proportional to 128,636.10, 193,167.99 and 86,785.43

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Solution

The fourth proportional to 128,636.10, 193,167.99 and 86,785.43 is: 130,322.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,636.10 : 193,167.99 = 86,785.43 : x
  2. Step 2: Convert to fraction form
    128,636.10/193,167.99 = 86,785.43/x
  3. Step 3: Cross multiply
    128,636.10x = 193,167.99 × 86,785.43
  4. Step 4: Simplify right side
    128,636.10x = 16,764,166,108.55
  5. Step 5: Solve for x
    x = 16,764,166,108.55/128,636.10
  6. Step 6: Final answer
    x = 130,322.41

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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.