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Finding the Fourth Proportional to 65,501.70, 98,252.55 and 21,129.90

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Solution

The fourth proportional to 65,501.70, 98,252.55 and 21,129.90 is: 31,694.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,501.70 : 98,252.55 = 21,129.90 : x
  2. Step 2: Convert to fraction form
    65,501.70/98,252.55 = 21,129.90/x
  3. Step 3: Cross multiply
    65,501.70x = 98,252.55 × 21,129.90
  4. Step 4: Simplify right side
    65,501.70x = 2,076,066,556.25
  5. Step 5: Solve for x
    x = 2,076,066,556.25/65,501.70
  6. Step 6: Final answer
    x = 31,694.85

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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.