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Finding the Fourth Proportional to 19,372, 26,720.88 and 11,920.48

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Solution

The fourth proportional to 19,372, 26,720.88 and 11,920.48 is: 16,442.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,372 : 26,720.88 = 11,920.48 : x
  2. Step 2: Convert to fraction form
    19,372/26,720.88 = 11,920.48/x
  3. Step 3: Cross multiply
    19,372x = 26,720.88 × 11,920.48
  4. Step 4: Simplify right side
    19,372x = 318,525,715.62
  5. Step 5: Solve for x
    x = 318,525,715.62/19,372
  6. Step 6: Final answer
    x = 16,442.58

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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.