Home / 85,791.15-128,816.33-66,091.95

Finding the Fourth Proportional to 85,791.15, 128,816.33 and 66,091.95

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Solution

The fourth proportional to 85,791.15, 128,816.33 and 66,091.95 is: 99,237.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,791.15 : 128,816.33 = 66,091.95 : x
  2. Step 2: Convert to fraction form
    85,791.15/128,816.33 = 66,091.95/x
  3. Step 3: Cross multiply
    85,791.15x = 128,816.33 × 66,091.95
  4. Step 4: Simplify right side
    85,791.15x = 8,513,722,111.08
  5. Step 5: Solve for x
    x = 8,513,722,111.08/85,791.15
  6. Step 6: Final answer
    x = 99,237.77

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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.