Home / 21,814.86-30,107.32-13,315.20

Finding the Fourth Proportional to 21,814.86, 30,107.32 and 13,315.20

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Solution

The fourth proportional to 21,814.86, 30,107.32 and 13,315.20 is: 18,376.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,814.86 : 30,107.32 = 13,315.20 : x
  2. Step 2: Convert to fraction form
    21,814.86/30,107.32 = 13,315.20/x
  3. Step 3: Cross multiply
    21,814.86x = 30,107.32 × 13,315.20
  4. Step 4: Simplify right side
    21,814.86x = 400,884,987.26
  5. Step 5: Solve for x
    x = 400,884,987.26/21,814.86
  6. Step 6: Final answer
    x = 18,376.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.