Home / 12,987.44-19,471.56-5,190.32

Finding the Fourth Proportional to 12,987.44, 19,471.56 and 5,190.32

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Solution

The fourth proportional to 12,987.44, 19,471.56 and 5,190.32 is: 7,781.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.44 : 19,471.56 = 5,190.32 : x
  2. Step 2: Convert to fraction form
    12,987.44/19,471.56 = 5,190.32/x
  3. Step 3: Cross multiply
    12,987.44x = 19,471.56 × 5,190.32
  4. Step 4: Simplify right side
    12,987.44x = 101,063,627.30
  5. Step 5: Solve for x
    x = 101,063,627.30/12,987.44
  6. Step 6: Final answer
    x = 7,781.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.