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Finding the Fourth Proportional to 39,763.84, 54,874.08 and 21,860

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Solution

The fourth proportional to 39,763.84, 54,874.08 and 21,860 is: 30,166.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,763.84 : 54,874.08 = 21,860 : x
  2. Step 2: Convert to fraction form
    39,763.84/54,874.08 = 21,860/x
  3. Step 3: Cross multiply
    39,763.84x = 54,874.08 × 21,860
  4. Step 4: Simplify right side
    39,763.84x = 1,199,547,388.80
  5. Step 5: Solve for x
    x = 1,199,547,388.80/39,763.84
  6. Step 6: Final answer
    x = 30,166.79

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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.