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Finding the Fourth Proportional to 128,916.20, 193,220.70 and 54,036.20

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Solution

The fourth proportional to 128,916.20, 193,220.70 and 54,036.20 is: 80,989.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,916.20 : 193,220.70 = 54,036.20 : x
  2. Step 2: Convert to fraction form
    128,916.20/193,220.70 = 54,036.20/x
  3. Step 3: Cross multiply
    128,916.20x = 193,220.70 × 54,036.20
  4. Step 4: Simplify right side
    128,916.20x = 10,440,912,389.34
  5. Step 5: Solve for x
    x = 10,440,912,389.34/128,916.20
  6. Step 6: Final answer
    x = 80,989.92

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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.