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Finding the Fourth Proportional to 85,751.51, 128,558.57 and 40,750.28

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Solution

The fourth proportional to 85,751.51, 128,558.57 and 40,750.28 is: 61,092.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,751.51 : 128,558.57 = 40,750.28 : x
  2. Step 2: Convert to fraction form
    85,751.51/128,558.57 = 40,750.28/x
  3. Step 3: Cross multiply
    85,751.51x = 128,558.57 × 40,750.28
  4. Step 4: Simplify right side
    85,751.51x = 5,238,796,877.36
  5. Step 5: Solve for x
    x = 5,238,796,877.36/85,751.51
  6. Step 6: Final answer
    x = 61,092.77

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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.