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Finding the Fourth Proportional to 39,643.50, 54,709.69 and 21,739.19

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Solution

The fourth proportional to 39,643.50, 54,709.69 and 21,739.19 is: 30,000.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,643.50 : 54,709.69 = 21,739.19 : x
  2. Step 2: Convert to fraction form
    39,643.50/54,709.69 = 21,739.19/x
  3. Step 3: Cross multiply
    39,643.50x = 54,709.69 × 21,739.19
  4. Step 4: Simplify right side
    39,643.50x = 1,189,344,428.18
  5. Step 5: Solve for x
    x = 1,189,344,428.18/39,643.50
  6. Step 6: Final answer
    x = 30,000.99

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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.