Home / 13,986.19-20,987.51-5,221.79

Finding the Fourth Proportional to 13,986.19, 20,987.51 and 5,221.79

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Solution

The fourth proportional to 13,986.19, 20,987.51 and 5,221.79 is: 7,835.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.19 : 20,987.51 = 5,221.79 : x
  2. Step 2: Convert to fraction form
    13,986.19/20,987.51 = 5,221.79/x
  3. Step 3: Cross multiply
    13,986.19x = 20,987.51 × 5,221.79
  4. Step 4: Simplify right side
    13,986.19x = 109,592,369.84
  5. Step 5: Solve for x
    x = 109,592,369.84/13,986.19
  6. Step 6: Final answer
    x = 7,835.76

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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.