Home / 28,355.25-39,131.97-15,780

Finding the Fourth Proportional to 28,355.25, 39,131.97 and 15,780

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Solution

The fourth proportional to 28,355.25, 39,131.97 and 15,780 is: 21,777.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.25 : 39,131.97 = 15,780 : x
  2. Step 2: Convert to fraction form
    28,355.25/39,131.97 = 15,780/x
  3. Step 3: Cross multiply
    28,355.25x = 39,131.97 × 15,780
  4. Step 4: Simplify right side
    28,355.25x = 617,502,486.60
  5. Step 5: Solve for x
    x = 617,502,486.60/28,355.25
  6. Step 6: Final answer
    x = 21,777.36

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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.