Home / 85,455.11-128,177.80-23,120.75

Finding the Fourth Proportional to 85,455.11, 128,177.80 and 23,120.75

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Solution

The fourth proportional to 85,455.11, 128,177.80 and 23,120.75 is: 34,679.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,455.11 : 128,177.80 = 23,120.75 : x
  2. Step 2: Convert to fraction form
    85,455.11/128,177.80 = 23,120.75/x
  3. Step 3: Cross multiply
    85,455.11x = 128,177.80 × 23,120.75
  4. Step 4: Simplify right side
    85,455.11x = 2,963,566,869.35
  5. Step 5: Solve for x
    x = 2,963,566,869.35/85,455.11
  6. Step 6: Final answer
    x = 34,679.81

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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.