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Finding the Fourth Proportional to 39,309.50, 54,247.12 and 21,645.50

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Solution

The fourth proportional to 39,309.50, 54,247.12 and 21,645.50 is: 29,870.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,309.50 : 54,247.12 = 21,645.50 : x
  2. Step 2: Convert to fraction form
    39,309.50/54,247.12 = 21,645.50/x
  3. Step 3: Cross multiply
    39,309.50x = 54,247.12 × 21,645.50
  4. Step 4: Simplify right side
    39,309.50x = 1,174,206,035.96
  5. Step 5: Solve for x
    x = 1,174,206,035.96/39,309.50
  6. Step 6: Final answer
    x = 29,870.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.