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Finding the Fourth Proportional to 8,788.64, 12,128.36 and 4,809.80

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Solution

The fourth proportional to 8,788.64, 12,128.36 and 4,809.80 is: 6,637.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,788.64 : 12,128.36 = 4,809.80 : x
  2. Step 2: Convert to fraction form
    8,788.64/12,128.36 = 4,809.80/x
  3. Step 3: Cross multiply
    8,788.64x = 12,128.36 × 4,809.80
  4. Step 4: Simplify right side
    8,788.64x = 58,334,992.20
  5. Step 5: Solve for x
    x = 58,334,992.20/8,788.64
  6. Step 6: Final answer
    x = 6,637.55

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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.