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Finding the Fourth Proportional to 65,720, 98,559.12 and 21,336.48

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Solution

The fourth proportional to 65,720, 98,559.12 and 21,336.48 is: 31,997.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720 : 98,559.12 = 21,336.48 : x
  2. Step 2: Convert to fraction form
    65,720/98,559.12 = 21,336.48/x
  3. Step 3: Cross multiply
    65,720x = 98,559.12 × 21,336.48
  4. Step 4: Simplify right side
    65,720x = 2,102,904,692.70
  5. Step 5: Solve for x
    x = 2,102,904,692.70/65,720
  6. Step 6: Final answer
    x = 31,997.94

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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.