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Finding the Fourth Proportional to 14,279.76, 21,415.53 and 4,919.40

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Solution

The fourth proportional to 14,279.76, 21,415.53 and 4,919.40 is: 7,377.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,279.76 : 21,415.53 = 4,919.40 : x
  2. Step 2: Convert to fraction form
    14,279.76/21,415.53 = 4,919.40/x
  3. Step 3: Cross multiply
    14,279.76x = 21,415.53 × 4,919.40
  4. Step 4: Simplify right side
    14,279.76x = 105,351,558.28
  5. Step 5: Solve for x
    x = 105,351,558.28/14,279.76
  6. Step 6: Final answer
    x = 7,377.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.