Home / 21,115.26-31,683.90-15,319.68

Finding the Fourth Proportional to 21,115.26, 31,683.90 and 15,319.68

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Solution

The fourth proportional to 21,115.26, 31,683.90 and 15,319.68 is: 22,987.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.26 : 31,683.90 = 15,319.68 : x
  2. Step 2: Convert to fraction form
    21,115.26/31,683.90 = 15,319.68/x
  3. Step 3: Cross multiply
    21,115.26x = 31,683.90 × 15,319.68
  4. Step 4: Simplify right side
    21,115.26x = 485,387,209.15
  5. Step 5: Solve for x
    x = 485,387,209.15/21,115.26
  6. Step 6: Final answer
    x = 22,987.51

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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.