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Finding the Fourth Proportional to 77,391.56, 116,139.12 and 28,143.56

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Solution

The fourth proportional to 77,391.56, 116,139.12 and 28,143.56 is: 42,234.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,391.56 : 116,139.12 = 28,143.56 : x
  2. Step 2: Convert to fraction form
    77,391.56/116,139.12 = 28,143.56/x
  3. Step 3: Cross multiply
    77,391.56x = 116,139.12 × 28,143.56
  4. Step 4: Simplify right side
    77,391.56x = 3,268,568,292.07
  5. Step 5: Solve for x
    x = 3,268,568,292.07/77,391.56
  6. Step 6: Final answer
    x = 42,234.17

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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.