Home / 20,987.20-28,961.64-11,555.74

Finding the Fourth Proportional to 20,987.20, 28,961.64 and 11,555.74

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Solution

The fourth proportional to 20,987.20, 28,961.64 and 11,555.74 is: 15,946.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.20 : 28,961.64 = 11,555.74 : x
  2. Step 2: Convert to fraction form
    20,987.20/28,961.64 = 11,555.74/x
  3. Step 3: Cross multiply
    20,987.20x = 28,961.64 × 11,555.74
  4. Step 4: Simplify right side
    20,987.20x = 334,673,181.81
  5. Step 5: Solve for x
    x = 334,673,181.81/20,987.20
  6. Step 6: Final answer
    x = 15,946.54

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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.