Home / 20,886.81-28,825.17-11,455.38

Finding the Fourth Proportional to 20,886.81, 28,825.17 and 11,455.38

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Solution

The fourth proportional to 20,886.81, 28,825.17 and 11,455.38 is: 15,809.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.81 : 28,825.17 = 11,455.38 : x
  2. Step 2: Convert to fraction form
    20,886.81/28,825.17 = 11,455.38/x
  3. Step 3: Cross multiply
    20,886.81x = 28,825.17 × 11,455.38
  4. Step 4: Simplify right side
    20,886.81x = 330,203,275.91
  5. Step 5: Solve for x
    x = 330,203,275.91/20,886.81
  6. Step 6: Final answer
    x = 15,809.18

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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.