Home / 20,930.41-28,891.56-13,859.11

Finding the Fourth Proportional to 20,930.41, 28,891.56 and 13,859.11

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Solution

The fourth proportional to 20,930.41, 28,891.56 and 13,859.11 is: 19,130.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.41 : 28,891.56 = 13,859.11 : x
  2. Step 2: Convert to fraction form
    20,930.41/28,891.56 = 13,859.11/x
  3. Step 3: Cross multiply
    20,930.41x = 28,891.56 × 13,859.11
  4. Step 4: Simplify right side
    20,930.41x = 400,411,308.11
  5. Step 5: Solve for x
    x = 400,411,308.11/20,930.41
  6. Step 6: Final answer
    x = 19,130.60

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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.