Home / 13,221.25-19,831.89-3,987.25

Finding the Fourth Proportional to 13,221.25, 19,831.89 and 3,987.25

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Solution

The fourth proportional to 13,221.25, 19,831.89 and 3,987.25 is: 5,980.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.25 : 19,831.89 = 3,987.25 : x
  2. Step 2: Convert to fraction form
    13,221.25/19,831.89 = 3,987.25/x
  3. Step 3: Cross multiply
    13,221.25x = 19,831.89 × 3,987.25
  4. Step 4: Simplify right side
    13,221.25x = 79,074,703.40
  5. Step 5: Solve for x
    x = 79,074,703.40/13,221.25
  6. Step 6: Final answer
    x = 5,980.88

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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.