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Finding the Fourth Proportional to 39,655.99, 54,722.72 and 21,747.20

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Solution

The fourth proportional to 39,655.99, 54,722.72 and 21,747.20 is: 30,009.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,655.99 : 54,722.72 = 21,747.20 : x
  2. Step 2: Convert to fraction form
    39,655.99/54,722.72 = 21,747.20/x
  3. Step 3: Cross multiply
    39,655.99x = 54,722.72 × 21,747.20
  4. Step 4: Simplify right side
    39,655.99x = 1,190,065,717.14
  5. Step 5: Solve for x
    x = 1,190,065,717.14/39,655.99
  6. Step 6: Final answer
    x = 30,009.73

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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.