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Finding the Fourth Proportional to 18,678.88, 25,774.80 and 10,721.44

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Solution

The fourth proportional to 18,678.88, 25,774.80 and 10,721.44 is: 14,794.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,678.88 : 25,774.80 = 10,721.44 : x
  2. Step 2: Convert to fraction form
    18,678.88/25,774.80 = 10,721.44/x
  3. Step 3: Cross multiply
    18,678.88x = 25,774.80 × 10,721.44
  4. Step 4: Simplify right side
    18,678.88x = 276,342,971.71
  5. Step 5: Solve for x
    x = 276,342,971.71/18,678.88
  6. Step 6: Final answer
    x = 14,794.41

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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.