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Finding the Fourth Proportional to 86,940.70, 130,411.05 and 84,480.33

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Solution

The fourth proportional to 86,940.70, 130,411.05 and 84,480.33 is: 126,720.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,940.70 : 130,411.05 = 84,480.33 : x
  2. Step 2: Convert to fraction form
    86,940.70/130,411.05 = 84,480.33/x
  3. Step 3: Cross multiply
    86,940.70x = 130,411.05 × 84,480.33
  4. Step 4: Simplify right side
    86,940.70x = 11,017,167,887.59
  5. Step 5: Solve for x
    x = 11,017,167,887.59/86,940.70
  6. Step 6: Final answer
    x = 126,720.49

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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.