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Finding the Fourth Proportional to 8,390, 11,578.92 and 4,664.72

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Solution

The fourth proportional to 8,390, 11,578.92 and 4,664.72 is: 6,437.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390 : 11,578.92 = 4,664.72 : x
  2. Step 2: Convert to fraction form
    8,390/11,578.92 = 4,664.72/x
  3. Step 3: Cross multiply
    8,390x = 11,578.92 × 4,664.72
  4. Step 4: Simplify right side
    8,390x = 54,012,419.70
  5. Step 5: Solve for x
    x = 54,012,419.70/8,390
  6. Step 6: Final answer
    x = 6,437.71

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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.