Home / 103,839.68-143,308.78-66,111.50

Finding the Fourth Proportional to 103,839.68, 143,308.78 and 66,111.50

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Solution

The fourth proportional to 103,839.68, 143,308.78 and 66,111.50 is: 91,240.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,839.68 : 143,308.78 = 66,111.50 : x
  2. Step 2: Convert to fraction form
    103,839.68/143,308.78 = 66,111.50/x
  3. Step 3: Cross multiply
    103,839.68x = 143,308.78 × 66,111.50
  4. Step 4: Simplify right side
    103,839.68x = 9,474,358,408.97
  5. Step 5: Solve for x
    x = 9,474,358,408.97/103,839.68
  6. Step 6: Final answer
    x = 91,240.25

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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.