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Finding the Fourth Proportional to 128,328.30, 192,519.79 and 65,156.81

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Solution

The fourth proportional to 128,328.30, 192,519.79 and 65,156.81 is: 97,749.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,328.30 : 192,519.79 = 65,156.81 : x
  2. Step 2: Convert to fraction form
    128,328.30/192,519.79 = 65,156.81/x
  3. Step 3: Cross multiply
    128,328.30x = 192,519.79 × 65,156.81
  4. Step 4: Simplify right side
    128,328.30x = 12,543,974,252.78
  5. Step 5: Solve for x
    x = 12,543,974,252.78/128,328.30
  6. Step 6: Final answer
    x = 97,749.09

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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.