Home / 100,402.21-138,558.05-55,689.25

Finding the Fourth Proportional to 100,402.21, 138,558.05 and 55,689.25

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Solution

The fourth proportional to 100,402.21, 138,558.05 and 55,689.25 is: 76,852.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,402.21 : 138,558.05 = 55,689.25 : x
  2. Step 2: Convert to fraction form
    100,402.21/138,558.05 = 55,689.25/x
  3. Step 3: Cross multiply
    100,402.21x = 138,558.05 × 55,689.25
  4. Step 4: Simplify right side
    100,402.21x = 7,716,193,885.96
  5. Step 5: Solve for x
    x = 7,716,193,885.96/100,402.21
  6. Step 6: Final answer
    x = 76,852.83

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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.