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Finding the Fourth Proportional to 9,279, 12,808.26 and 5,553

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Solution

The fourth proportional to 9,279, 12,808.26 and 5,553 is: 7,665.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,279 : 12,808.26 = 5,553 : x
  2. Step 2: Convert to fraction form
    9,279/12,808.26 = 5,553/x
  3. Step 3: Cross multiply
    9,279x = 12,808.26 × 5,553
  4. Step 4: Simplify right side
    9,279x = 71,124,267.78
  5. Step 5: Solve for x
    x = 71,124,267.78/9,279
  6. Step 6: Final answer
    x = 7,665.08

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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.