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Finding the Fourth Proportional to 18,959.88, 26,129.21 and 13,645.47

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Solution

The fourth proportional to 18,959.88, 26,129.21 and 13,645.47 is: 18,805.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.88 : 26,129.21 = 13,645.47 : x
  2. Step 2: Convert to fraction form
    18,959.88/26,129.21 = 13,645.47/x
  3. Step 3: Cross multiply
    18,959.88x = 26,129.21 × 13,645.47
  4. Step 4: Simplify right side
    18,959.88x = 356,545,282.95
  5. Step 5: Solve for x
    x = 356,545,282.95/18,959.88
  6. Step 6: Final answer
    x = 18,805.25

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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.