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Finding the Fourth Proportional to 85,778.29, 128,813.60 and 55,843.51

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Solution

The fourth proportional to 85,778.29, 128,813.60 and 55,843.51 is: 83,860.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,778.29 : 128,813.60 = 55,843.51 : x
  2. Step 2: Convert to fraction form
    85,778.29/128,813.60 = 55,843.51/x
  3. Step 3: Cross multiply
    85,778.29x = 128,813.60 × 55,843.51
  4. Step 4: Simplify right side
    85,778.29x = 7,193,403,559.74
  5. Step 5: Solve for x
    x = 7,193,403,559.74/85,778.29
  6. Step 6: Final answer
    x = 83,860.42

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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.