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Finding the Fourth Proportional to 85,989.54, 128,969.70 and 39,231.48

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Solution

The fourth proportional to 85,989.54, 128,969.70 and 39,231.48 is: 58,840.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,989.54 : 128,969.70 = 39,231.48 : x
  2. Step 2: Convert to fraction form
    85,989.54/128,969.70 = 39,231.48/x
  3. Step 3: Cross multiply
    85,989.54x = 128,969.70 × 39,231.48
  4. Step 4: Simplify right side
    85,989.54x = 5,059,672,206.16
  5. Step 5: Solve for x
    x = 5,059,672,206.16/85,989.54
  6. Step 6: Final answer
    x = 58,840.55

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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.