Home / 20,818.13-28,729.47-11,386.69

Finding the Fourth Proportional to 20,818.13, 28,729.47 and 11,386.69

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Solution

The fourth proportional to 20,818.13, 28,729.47 and 11,386.69 is: 15,713.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.13 : 28,729.47 = 11,386.69 : x
  2. Step 2: Convert to fraction form
    20,818.13/28,729.47 = 11,386.69/x
  3. Step 3: Cross multiply
    20,818.13x = 28,729.47 × 11,386.69
  4. Step 4: Simplify right side
    20,818.13x = 327,133,539.63
  5. Step 5: Solve for x
    x = 327,133,539.63/20,818.13
  6. Step 6: Final answer
    x = 15,713.88

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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.