Home / 78,077.30-117,115.64-18,912.87

Finding the Fourth Proportional to 78,077.30, 117,115.64 and 18,912.87

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Solution

The fourth proportional to 78,077.30, 117,115.64 and 18,912.87 is: 28,369.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,077.30 : 117,115.64 = 18,912.87 : x
  2. Step 2: Convert to fraction form
    78,077.30/117,115.64 = 18,912.87/x
  3. Step 3: Cross multiply
    78,077.30x = 117,115.64 × 18,912.87
  4. Step 4: Simplify right side
    78,077.30x = 2,214,992,779.72
  5. Step 5: Solve for x
    x = 2,214,992,779.72/78,077.30
  6. Step 6: Final answer
    x = 28,369.23

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1.5x scale

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.