Home / 21,818.79-30,112.80-13,319.16

Finding the Fourth Proportional to 21,818.79, 30,112.80 and 13,319.16

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Solution

The fourth proportional to 21,818.79, 30,112.80 and 13,319.16 is: 18,382.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,818.79 : 30,112.80 = 13,319.16 : x
  2. Step 2: Convert to fraction form
    21,818.79/30,112.80 = 13,319.16/x
  3. Step 3: Cross multiply
    21,818.79x = 30,112.80 × 13,319.16
  4. Step 4: Simplify right side
    21,818.79x = 401,077,201.25
  5. Step 5: Solve for x
    x = 401,077,201.25/21,818.79
  6. Step 6: Final answer
    x = 18,382.19

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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.