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Finding the Fourth Proportional to 128,722.72, 192,934.56 and 48,709.81

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Solution

The fourth proportional to 128,722.72, 192,934.56 and 48,709.81 is: 73,008.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,722.72 : 192,934.56 = 48,709.81 : x
  2. Step 2: Convert to fraction form
    128,722.72/192,934.56 = 48,709.81/x
  3. Step 3: Cross multiply
    128,722.72x = 192,934.56 × 48,709.81
  4. Step 4: Simplify right side
    128,722.72x = 9,397,804,824.61
  5. Step 5: Solve for x
    x = 9,397,804,824.61/128,722.72
  6. Step 6: Final answer
    x = 73,008.13

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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.