Home / 78,145.29-117,216.32-18,981.27

Finding the Fourth Proportional to 78,145.29, 117,216.32 and 18,981.27

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Solution

The fourth proportional to 78,145.29, 117,216.32 and 18,981.27 is: 28,471.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,145.29 : 117,216.32 = 18,981.27 : x
  2. Step 2: Convert to fraction form
    78,145.29/117,216.32 = 18,981.27/x
  3. Step 3: Cross multiply
    78,145.29x = 117,216.32 × 18,981.27
  4. Step 4: Simplify right side
    78,145.29x = 2,224,914,523.42
  5. Step 5: Solve for x
    x = 2,224,914,523.42/78,145.29
  6. Step 6: Final answer
    x = 28,471.51

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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.