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Finding the Fourth Proportional to 39,412.47, 54,388.87 and 21,506.87

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Solution

The fourth proportional to 39,412.47, 54,388.87 and 21,506.87 is: 29,679.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,412.47 : 54,388.87 = 21,506.87 : x
  2. Step 2: Convert to fraction form
    39,412.47/54,388.87 = 21,506.87/x
  3. Step 3: Cross multiply
    39,412.47x = 54,388.87 × 21,506.87
  4. Step 4: Simplify right side
    39,412.47x = 1,169,734,132.80
  5. Step 5: Solve for x
    x = 1,169,734,132.80/39,412.47
  6. Step 6: Final answer
    x = 29,679.29

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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.