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Finding the Fourth Proportional to 61,146.70, 91,720.05 and 21,707.80

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Solution

The fourth proportional to 61,146.70, 91,720.05 and 21,707.80 is: 32,561.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,146.70 : 91,720.05 = 21,707.80 : x
  2. Step 2: Convert to fraction form
    61,146.70/91,720.05 = 21,707.80/x
  3. Step 3: Cross multiply
    61,146.70x = 91,720.05 × 21,707.80
  4. Step 4: Simplify right side
    61,146.70x = 1,991,040,501.39
  5. Step 5: Solve for x
    x = 1,991,040,501.39/61,146.70
  6. Step 6: Final answer
    x = 32,561.70

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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.