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Finding the Fourth Proportional to 8,391, 11,579.62 and 4,665

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Solution

The fourth proportional to 8,391, 11,579.62 and 4,665 is: 6,437.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391 : 11,579.62 = 4,665 : x
  2. Step 2: Convert to fraction form
    8,391/11,579.62 = 4,665/x
  3. Step 3: Cross multiply
    8,391x = 11,579.62 × 4,665
  4. Step 4: Simplify right side
    8,391x = 54,018,927.30
  5. Step 5: Solve for x
    x = 54,018,927.30/8,391
  6. Step 6: Final answer
    x = 6,437.72

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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.