Home / 100,669.96-138,921.60-55,347.89

Finding the Fourth Proportional to 100,669.96, 138,921.60 and 55,347.89

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Solution

The fourth proportional to 100,669.96, 138,921.60 and 55,347.89 is: 76,378.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,669.96 : 138,921.60 = 55,347.89 : x
  2. Step 2: Convert to fraction form
    100,669.96/138,921.60 = 55,347.89/x
  3. Step 3: Cross multiply
    100,669.96x = 138,921.60 × 55,347.89
  4. Step 4: Simplify right side
    100,669.96x = 7,689,017,990.28
  5. Step 5: Solve for x
    x = 7,689,017,990.28/100,669.96
  6. Step 6: Final answer
    x = 76,378.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.