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Finding the Fourth Proportional to 104,991.36, 157,331.46 and 86,403.48

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Solution

The fourth proportional to 104,991.36, 157,331.46 and 86,403.48 is: 129,477.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,991.36 : 157,331.46 = 86,403.48 : x
  2. Step 2: Convert to fraction form
    104,991.36/157,331.46 = 86,403.48/x
  3. Step 3: Cross multiply
    104,991.36x = 157,331.46 × 86,403.48
  4. Step 4: Simplify right side
    104,991.36x = 13,593,985,657.48
  5. Step 5: Solve for x
    x = 13,593,985,657.48/104,991.36
  6. Step 6: Final answer
    x = 129,477.18

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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.