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Finding the Fourth Proportional to 65,720.70, 98,571.79 and 21,347.99

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Solution

The fourth proportional to 65,720.70, 98,571.79 and 21,347.99 is: 32,018.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.70 : 98,571.79 = 21,347.99 : x
  2. Step 2: Convert to fraction form
    65,720.70/98,571.79 = 21,347.99/x
  3. Step 3: Cross multiply
    65,720.70x = 98,571.79 × 21,347.99
  4. Step 4: Simplify right side
    65,720.70x = 2,104,309,587.20
  5. Step 5: Solve for x
    x = 2,104,309,587.20/65,720.70
  6. Step 6: Final answer
    x = 32,018.98

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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.