Home / 20,987.55-28,962.81-11,556

Finding the Fourth Proportional to 20,987.55, 28,962.81 and 11,556

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Solution

The fourth proportional to 20,987.55, 28,962.81 and 11,556 is: 15,947.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.55 : 28,962.81 = 11,556 : x
  2. Step 2: Convert to fraction form
    20,987.55/28,962.81 = 11,556/x
  3. Step 3: Cross multiply
    20,987.55x = 28,962.81 × 11,556
  4. Step 4: Simplify right side
    20,987.55x = 334,694,232.36
  5. Step 5: Solve for x
    x = 334,694,232.36/20,987.55
  6. Step 6: Final answer
    x = 15,947.28

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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.