Home / 20,987.85-28,962.57-12,488.03

Finding the Fourth Proportional to 20,987.85, 28,962.57 and 12,488.03

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Solution

The fourth proportional to 20,987.85, 28,962.57 and 12,488.03 is: 17,233.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.85 : 28,962.57 = 12,488.03 : x
  2. Step 2: Convert to fraction form
    20,987.85/28,962.57 = 12,488.03/x
  3. Step 3: Cross multiply
    20,987.85x = 28,962.57 × 12,488.03
  4. Step 4: Simplify right side
    20,987.85x = 361,685,443.04
  5. Step 5: Solve for x
    x = 361,685,443.04/20,987.85
  6. Step 6: Final answer
    x = 17,233.09

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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.