Home / 128,879.10-193,318.65-86,779.35

Finding the Fourth Proportional to 128,879.10, 193,318.65 and 86,779.35

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Solution

The fourth proportional to 128,879.10, 193,318.65 and 86,779.35 is: 130,169.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,879.10 : 193,318.65 = 86,779.35 : x
  2. Step 2: Convert to fraction form
    128,879.10/193,318.65 = 86,779.35/x
  3. Step 3: Cross multiply
    128,879.10x = 193,318.65 × 86,779.35
  4. Step 4: Simplify right side
    128,879.10x = 16,776,066,789.88
  5. Step 5: Solve for x
    x = 16,776,066,789.88/128,879.10
  6. Step 6: Final answer
    x = 130,169.03

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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.