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Finding the Fourth Proportional to 8,618.80, 11,893.92 and 4,842

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Solution

The fourth proportional to 8,618.80, 11,893.92 and 4,842 is: 6,681.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,618.80 : 11,893.92 = 4,842 : x
  2. Step 2: Convert to fraction form
    8,618.80/11,893.92 = 4,842/x
  3. Step 3: Cross multiply
    8,618.80x = 11,893.92 × 4,842
  4. Step 4: Simplify right side
    8,618.80x = 57,590,360.64
  5. Step 5: Solve for x
    x = 57,590,360.64/8,618.80
  6. Step 6: Final answer
    x = 6,681.95

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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.