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Finding the Fourth Proportional to 39,572, 54,609.36 and 21,908

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Solution

The fourth proportional to 39,572, 54,609.36 and 21,908 is: 30,233.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,572 : 54,609.36 = 21,908 : x
  2. Step 2: Convert to fraction form
    39,572/54,609.36 = 21,908/x
  3. Step 3: Cross multiply
    39,572x = 54,609.36 × 21,908
  4. Step 4: Simplify right side
    39,572x = 1,196,381,858.88
  5. Step 5: Solve for x
    x = 1,196,381,858.88/39,572
  6. Step 6: Final answer
    x = 30,233.04

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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.