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Finding the Fourth Proportional to 14,513.79, 21,780.40 and 5,279.79

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Solution

The fourth proportional to 14,513.79, 21,780.40 and 5,279.79 is: 7,923.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,513.79 : 21,780.40 = 5,279.79 : x
  2. Step 2: Convert to fraction form
    14,513.79/21,780.40 = 5,279.79/x
  3. Step 3: Cross multiply
    14,513.79x = 21,780.40 × 5,279.79
  4. Step 4: Simplify right side
    14,513.79x = 114,995,938.12
  5. Step 5: Solve for x
    x = 114,995,938.12/14,513.79
  6. Step 6: Final answer
    x = 7,923.22

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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.