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Finding the Fourth Proportional to 8,790, 12,129.84 and 4,811.28

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Solution

The fourth proportional to 8,790, 12,129.84 and 4,811.28 is: 6,639.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,790 : 12,129.84 = 4,811.28 : x
  2. Step 2: Convert to fraction form
    8,790/12,129.84 = 4,811.28/x
  3. Step 3: Cross multiply
    8,790x = 12,129.84 × 4,811.28
  4. Step 4: Simplify right side
    8,790x = 58,360,056.60
  5. Step 5: Solve for x
    x = 58,360,056.60/8,790
  6. Step 6: Final answer
    x = 6,639.37

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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.