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Finding the Fourth Proportional to 85,745.28, 128,569.68 and 35,771.52

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Solution

The fourth proportional to 85,745.28, 128,569.68 and 35,771.52 is: 53,637.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,745.28 : 128,569.68 = 35,771.52 : x
  2. Step 2: Convert to fraction form
    85,745.28/128,569.68 = 35,771.52/x
  3. Step 3: Cross multiply
    85,745.28x = 128,569.68 × 35,771.52
  4. Step 4: Simplify right side
    85,745.28x = 4,599,132,879.51
  5. Step 5: Solve for x
    x = 4,599,132,879.51/85,745.28
  6. Step 6: Final answer
    x = 53,637.16

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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.