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Finding the Fourth Proportional to 65,721.21, 98,572.55 and 21,348.50

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Solution

The fourth proportional to 65,721.21, 98,572.55 and 21,348.50 is: 32,019.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,721.21 : 98,572.55 = 21,348.50 : x
  2. Step 2: Convert to fraction form
    65,721.21/98,572.55 = 21,348.50/x
  3. Step 3: Cross multiply
    65,721.21x = 98,572.55 × 21,348.50
  4. Step 4: Simplify right side
    65,721.21x = 2,104,375,484.07
  5. Step 5: Solve for x
    x = 2,104,375,484.07/65,721.21
  6. Step 6: Final answer
    x = 32,019.73

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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.