Home / 21,812.31-30,104.28-13,319.37

Finding the Fourth Proportional to 21,812.31, 30,104.28 and 13,319.37

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Solution

The fourth proportional to 21,812.31, 30,104.28 and 13,319.37 is: 18,382.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,812.31 : 30,104.28 = 13,319.37 : x
  2. Step 2: Convert to fraction form
    21,812.31/30,104.28 = 13,319.37/x
  3. Step 3: Cross multiply
    21,812.31x = 30,104.28 × 13,319.37
  4. Step 4: Simplify right side
    21,812.31x = 400,970,043.90
  5. Step 5: Solve for x
    x = 400,970,043.90/21,812.31
  6. Step 6: Final answer
    x = 18,382.74

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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.