Home / 20,781.39-31,167.63-5,987.55

Finding the Fourth Proportional to 20,781.39, 31,167.63 and 5,987.55

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Solution

The fourth proportional to 20,781.39, 31,167.63 and 5,987.55 is: 8,980.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.39 : 31,167.63 = 5,987.55 : x
  2. Step 2: Convert to fraction form
    20,781.39/31,167.63 = 5,987.55/x
  3. Step 3: Cross multiply
    20,781.39x = 31,167.63 × 5,987.55
  4. Step 4: Simplify right side
    20,781.39x = 186,617,743.01
  5. Step 5: Solve for x
    x = 186,617,743.01/20,781.39
  6. Step 6: Final answer
    x = 8,980.04

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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.