Home / 39,686.90-54,768.49-21,781.58

Finding the Fourth Proportional to 39,686.90, 54,768.49 and 21,781.58

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Solution

The fourth proportional to 39,686.90, 54,768.49 and 21,781.58 is: 30,058.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,686.90 : 54,768.49 = 21,781.58 : x
  2. Step 2: Convert to fraction form
    39,686.90/54,768.49 = 21,781.58/x
  3. Step 3: Cross multiply
    39,686.90x = 54,768.49 × 21,781.58
  4. Step 4: Simplify right side
    39,686.90x = 1,192,944,246.41
  5. Step 5: Solve for x
    x = 1,192,944,246.41/39,686.90
  6. Step 6: Final answer
    x = 30,058.89

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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.