Home / 20,987.58-28,962.45-11,556.30

Finding the Fourth Proportional to 20,987.58, 28,962.45 and 11,556.30

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Solution

The fourth proportional to 20,987.58, 28,962.45 and 11,556.30 is: 15,947.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.58 : 28,962.45 = 11,556.30 : x
  2. Step 2: Convert to fraction form
    20,987.58/28,962.45 = 11,556.30/x
  3. Step 3: Cross multiply
    20,987.58x = 28,962.45 × 11,556.30
  4. Step 4: Simplify right side
    20,987.58x = 334,698,760.94
  5. Step 5: Solve for x
    x = 334,698,760.94/20,987.58
  6. Step 6: Final answer
    x = 15,947.47

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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.