Home / 12,986.60-19,471.56-7,720.20

Finding the Fourth Proportional to 12,986.60, 19,471.56 and 7,720.20

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Solution

The fourth proportional to 12,986.60, 19,471.56 and 7,720.20 is: 11,575.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,986.60 : 19,471.56 = 7,720.20 : x
  2. Step 2: Convert to fraction form
    12,986.60/19,471.56 = 7,720.20/x
  3. Step 3: Cross multiply
    12,986.60x = 19,471.56 × 7,720.20
  4. Step 4: Simplify right side
    12,986.60x = 150,324,337.51
  5. Step 5: Solve for x
    x = 150,324,337.51/12,986.60
  6. Step 6: Final answer
    x = 11,575.35

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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.