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Finding the Fourth Proportional to 78,608.20, 117,912.64 and 19,443.68

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Solution

The fourth proportional to 78,608.20, 117,912.64 and 19,443.68 is: 29,165.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,608.20 : 117,912.64 = 19,443.68 : x
  2. Step 2: Convert to fraction form
    78,608.20/117,912.64 = 19,443.68/x
  3. Step 3: Cross multiply
    78,608.20x = 117,912.64 × 19,443.68
  4. Step 4: Simplify right side
    78,608.20x = 2,292,655,640.12
  5. Step 5: Solve for x
    x = 2,292,655,640.12/78,608.20
  6. Step 6: Final answer
    x = 29,165.60

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1.5x scale

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.