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Finding the Fourth Proportional to 128,892.99, 193,360.90 and 54,018.77

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Solution

The fourth proportional to 128,892.99, 193,360.90 and 54,018.77 is: 81,037.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,892.99 : 193,360.90 = 54,018.77 : x
  2. Step 2: Convert to fraction form
    128,892.99/193,360.90 = 54,018.77/x
  3. Step 3: Cross multiply
    128,892.99x = 193,360.90 × 54,018.77
  4. Step 4: Simplify right side
    128,892.99x = 10,445,116,747.19
  5. Step 5: Solve for x
    x = 10,445,116,747.19/128,892.99
  6. Step 6: Final answer
    x = 81,037.12

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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.