Home / 78,286.11-117,438.08-28,389.57

Finding the Fourth Proportional to 78,286.11, 117,438.08 and 28,389.57

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Solution

The fourth proportional to 78,286.11, 117,438.08 and 28,389.57 is: 42,587.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,286.11 : 117,438.08 = 28,389.57 : x
  2. Step 2: Convert to fraction form
    78,286.11/117,438.08 = 28,389.57/x
  3. Step 3: Cross multiply
    78,286.11x = 117,438.08 × 28,389.57
  4. Step 4: Simplify right side
    78,286.11x = 3,334,016,450.88
  5. Step 5: Solve for x
    x = 3,334,016,450.88/78,286.11
  6. Step 6: Final answer
    x = 42,587.59

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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.