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Finding the Fourth Proportional to 42,921.92, 64,373.04 and 11,759.60

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Solution

The fourth proportional to 42,921.92, 64,373.04 and 11,759.60 is: 17,636.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,921.92 : 64,373.04 = 11,759.60 : x
  2. Step 2: Convert to fraction form
    42,921.92/64,373.04 = 11,759.60/x
  3. Step 3: Cross multiply
    42,921.92x = 64,373.04 × 11,759.60
  4. Step 4: Simplify right side
    42,921.92x = 757,001,201.18
  5. Step 5: Solve for x
    x = 757,001,201.18/42,921.92
  6. Step 6: Final answer
    x = 17,636.70

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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.