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Finding the Fourth Proportional to 39,339, 54,287.82 and 21,675

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Solution

The fourth proportional to 39,339, 54,287.82 and 21,675 is: 29,911.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,339 : 54,287.82 = 21,675 : x
  2. Step 2: Convert to fraction form
    39,339/54,287.82 = 21,675/x
  3. Step 3: Cross multiply
    39,339x = 54,287.82 × 21,675
  4. Step 4: Simplify right side
    39,339x = 1,176,688,498.50
  5. Step 5: Solve for x
    x = 1,176,688,498.50/39,339
  6. Step 6: Final answer
    x = 29,911.50

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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.