Home / 39,828.90-54,962.82-21,680

Finding the Fourth Proportional to 39,828.90, 54,962.82 and 21,680

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Solution

The fourth proportional to 39,828.90, 54,962.82 and 21,680 is: 29,917.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,828.90 : 54,962.82 = 21,680 : x
  2. Step 2: Convert to fraction form
    39,828.90/54,962.82 = 21,680/x
  3. Step 3: Cross multiply
    39,828.90x = 54,962.82 × 21,680
  4. Step 4: Simplify right side
    39,828.90x = 1,191,593,937.60
  5. Step 5: Solve for x
    x = 1,191,593,937.60/39,828.90
  6. Step 6: Final answer
    x = 29,917.82

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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.