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Finding the Fourth Proportional to 141,298.78, 194,992.27 and 77,640.68

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Solution

The fourth proportional to 141,298.78, 194,992.27 and 77,640.68 is: 107,144.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,298.78 : 194,992.27 = 77,640.68 : x
  2. Step 2: Convert to fraction form
    141,298.78/194,992.27 = 77,640.68/x
  3. Step 3: Cross multiply
    141,298.78x = 194,992.27 × 77,640.68
  4. Step 4: Simplify right side
    141,298.78x = 15,139,331,317.01
  5. Step 5: Solve for x
    x = 15,139,331,317.01/141,298.78
  6. Step 6: Final answer
    x = 107,144.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.