Home / 78,081-117,121.09-18,916.67

Finding the Fourth Proportional to 78,081, 117,121.09 and 18,916.67

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Solution

The fourth proportional to 78,081, 117,121.09 and 18,916.67 is: 28,374.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,081 : 117,121.09 = 18,916.67 : x
  2. Step 2: Convert to fraction form
    78,081/117,121.09 = 18,916.67/x
  3. Step 3: Cross multiply
    78,081x = 117,121.09 × 18,916.67
  4. Step 4: Simplify right side
    78,081x = 2,215,541,009.57
  5. Step 5: Solve for x
    x = 2,215,541,009.57/78,081
  6. Step 6: Final answer
    x = 28,374.91

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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.