Home / 103,428.88-142,786.40-69,615.20

Finding the Fourth Proportional to 103,428.88, 142,786.40 and 69,615.20

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Solution

The fourth proportional to 103,428.88, 142,786.40 and 69,615.20 is: 96,105.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,428.88 : 142,786.40 = 69,615.20 : x
  2. Step 2: Convert to fraction form
    103,428.88/142,786.40 = 69,615.20/x
  3. Step 3: Cross multiply
    103,428.88x = 142,786.40 × 69,615.20
  4. Step 4: Simplify right side
    103,428.88x = 9,940,103,793.28
  5. Step 5: Solve for x
    x = 9,940,103,793.28/103,428.88
  6. Step 6: Final answer
    x = 96,105.69

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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.