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Finding the Fourth Proportional to 8,706, 12,015 and 4,980.72

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Solution

The fourth proportional to 8,706, 12,015 and 4,980.72 is: 6,873.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,706 : 12,015 = 4,980.72 : x
  2. Step 2: Convert to fraction form
    8,706/12,015 = 4,980.72/x
  3. Step 3: Cross multiply
    8,706x = 12,015 × 4,980.72
  4. Step 4: Simplify right side
    8,706x = 59,843,350.80
  5. Step 5: Solve for x
    x = 59,843,350.80/8,706
  6. Step 6: Final answer
    x = 6,873.81

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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.