Home / 28,987.67-39,982.95-20,392.09

Finding the Fourth Proportional to 28,987.67, 39,982.95 and 20,392.09

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Solution

The fourth proportional to 28,987.67, 39,982.95 and 20,392.09 is: 28,126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,987.67 : 39,982.95 = 20,392.09 : x
  2. Step 2: Convert to fraction form
    28,987.67/39,982.95 = 20,392.09/x
  3. Step 3: Cross multiply
    28,987.67x = 39,982.95 × 20,392.09
  4. Step 4: Simplify right side
    28,987.67x = 815,335,814.91
  5. Step 5: Solve for x
    x = 815,335,814.91/28,987.67
  6. Step 6: Final answer
    x = 28,126.98

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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.