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Finding the Fourth Proportional to 18,326, 25,279.80 and 13,028.72

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Solution

The fourth proportional to 18,326, 25,279.80 and 13,028.72 is: 17,972.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,326 : 25,279.80 = 13,028.72 : x
  2. Step 2: Convert to fraction form
    18,326/25,279.80 = 13,028.72/x
  3. Step 3: Cross multiply
    18,326x = 25,279.80 × 13,028.72
  4. Step 4: Simplify right side
    18,326x = 329,363,435.86
  5. Step 5: Solve for x
    x = 329,363,435.86/18,326
  6. Step 6: Final answer
    x = 17,972.47

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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.