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Finding the Fourth Proportional to 118,138.56, 163,035.12 and 64,428

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Solution

The fourth proportional to 118,138.56, 163,035.12 and 64,428 is: 88,912.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,138.56 : 163,035.12 = 64,428 : x
  2. Step 2: Convert to fraction form
    118,138.56/163,035.12 = 64,428/x
  3. Step 3: Cross multiply
    118,138.56x = 163,035.12 × 64,428
  4. Step 4: Simplify right side
    118,138.56x = 10,504,026,711.36
  5. Step 5: Solve for x
    x = 10,504,026,711.36/118,138.56
  6. Step 6: Final answer
    x = 88,912.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.