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Finding the Fourth Proportional to 128,732.70, 193,617.45 and 115,254.30

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Solution

The fourth proportional to 128,732.70, 193,617.45 and 115,254.30 is: 173,345.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,732.70 : 193,617.45 = 115,254.30 : x
  2. Step 2: Convert to fraction form
    128,732.70/193,617.45 = 115,254.30/x
  3. Step 3: Cross multiply
    128,732.70x = 193,617.45 × 115,254.30
  4. Step 4: Simplify right side
    128,732.70x = 22,315,243,667.54
  5. Step 5: Solve for x
    x = 22,315,243,667.54/128,732.70
  6. Step 6: Final answer
    x = 173,345.57

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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.